Ashburn Allergy PLLC

Ashburn Allergy PLLC

A medical clinic located in Ashburn, VA that specializes in allergic disorders. Dr. Jiun Yoon is a board-certified adult and pediatric allergist.

Accepting New Patients of All Ages!!

Operating as usual

It's now easier to call Ashburn Allergy PLLC. 08/10/2021

It's now easier to call Ashburn Allergy PLLC.

It's now easier to call Ashburn Allergy PLLC.

[08/10/21]   Friendly Reminder: The clinic will be closed Thursday, Aug. 12th and Friday, Aug. 13th

[07/02/21]   The office will be closed on Monday, July 5th in observance of Independence Day.

[06/16/21]   The clinic will be closed all next week from Monday, June 21st through Friday, June 25th for a much deserved and needed clinic vacation. The clinic was open the entire time including during the height of the COVID-19 pandemic and the staff did a remarkable job keeping the patients safe and cared for along with taking care of themselves. The clinic will open back up on Monday, June 29th refreshed and recharged!

Photos from Ashburn Allergy PLLC's post 05/07/2021

We want to thank our wonderful nurses!

[03/09/21]   The weather this week is forecasted to have temperatures in the upper 60s to low 70s with sunshine and a slight breeze. These conditions are optimal for the early pollinating trees in the area to start pollinating in large numbers. The early pollinating trees typically are the alders, hazels, maple, box elder, birch, elm, cypress, and cedar trees.

You can use second-generation oral antihistamines such as Allegra, Zyrtec, Claritin, or Xyzal for the itchy symptoms. Flonase, Nasacort, or Rhinocort are excellent for nasal congestion symptoms. Typically those require daily use and it may take 5-7 days to get the full 24-hour benefit of the nasal steroid sprays. For your ocular symptoms, Pataday is now over-the-counter and is highly effective for the itchy watery eyes.

If you want to see which environmental allergens are causing problems, then come in to see us and we can recommend an individualized treatment plan based on your skin testing for trees, grasses, weeds, cat, dog, other animals, dust mites, and molds.

Allergy Doctor Serving Ashburn 02/26/2021

Allergy Doctor Serving Ashburn

We get asked a lot of questions about the COVID-19 vaccines. Here are the two most common.
1. Should I get the vaccine?
For the vast majority of patients, they should get the vaccine when it is their turn. If concerned ask your doctor specifics that pertain to your medical history.
2. Which vaccine is the best?
They have different efficacy rates but the one statistic that they all share is that they reduce the severity of the infection and consequently your risk of death or serious complications. A wise person said the best COVID-19 vaccine is the first one that you can get when it is your turn. We completely agree.

Allergy Doctor Serving Ashburn If you need the help of an allergy doctor in Ashburn, contact Ashburn Allergy! We can help alleviate allergy symptoms for those in the area.

Allergy Doctor Serving Ashburn 02/10/2021

Allergy Doctor Serving Ashburn

Weather Updates/Clinic Status:
as of 02/12/[email protected]:30AM

We continue to monitor the weather forecasts. Clinic status may change depending on weather changes. Updates will be posted here and on our website home page (

Current Status: Normal Clinic Hours

Allergy Doctor Serving Ashburn If you need the help of an allergy doctor in Ashburn, contact Ashburn Allergy! We can help alleviate allergy symptoms for those in the area.

[02/01/21]   Weather Update: 2/1/2021 at 6PM

Delayed opening, Tuesday, Feb. 2nd at 10AM due to refreezing! Please be safe!

[01/31/21]   Weather Update: 1/31/2021 at 11AM
The area is currently under a winter storm warning from Sun-Tues. Predictions are for 4-8 inches of snow with some mixed precipitation including freezing rain. Out of an abundance of caution for our patients and staff coming from regions to the West, we have decided to close the clinic on Monday, Feb. 1st. We are currently planning to open as usual on Tuesday, Feb 2nd, but any changes will be posted here and on our page. Thank you for your understanding and stay safe!

Allergy Doctor Serving Ashburn 01/29/2021

Allergy Doctor Serving Ashburn

Weather Update: 01/29/2021
There is a potentially significant winter storm predicted for our area on Sun-Tues. Because of the current uncertainty, we will wait until Sunday afternoon to make a decision on closings or modified hours for the early part of next week.

Updates will also be posted on our website:

Allergy Doctor Serving Ashburn If you need the help of an allergy doctor in Ashburn, contact Ashburn Allergy! We can help alleviate allergy symptoms for those in the area.

[01/25/21]   Weather Update: 01/25/2021 at 3:30PM
Snow and ice are predicted overnight for the area, so out of an abundance of caution for the safety of the patients and the staff some of who are coming from the Western suburbs, we will have a delayed opening on Tuesday, 1/26/2021.
*****Tuesday, 1/26/2021 : Delayed opening at 10AM *****


2nd dose completed! In 2-3 weeks, my immune system should be primed to prevent COVID-19 infection by 95%! As more and more people get the vaccine, herd immunity will be established, and we can get back to as close to normal as possible!!

2nd dose completed! In 2-3 weeks, my immune system should be primed to prevent COVID-19 infection by 95%! As more and more people get the vaccine, herd immunity will be established, and we can get back to as close to normal as possible!!


Friendly reminder:

12/31 Modified hours today: 9am-3pm; last shot at 2:30pm
New Year’s Day: CLOSED

Happy New Year to Everyone!! May 2021 be a more normal and healthy year!!


First Pfizer-BioNTech COVID-19 vaccine done. Grateful for the tremendous efforts from all involved to get this and other vaccines to help end this pandemic. Hoping everyone can get the vaccine soon so we can all return to normal. Happy New Year and may everyone have a healthier and brighter 2021!!

[12/21/20]   Holiday Schedule

Christmas Eve (Thur. 12/24) and Christmas (Fri. 12/25) - CLOSED

[12/14/20]   *****UPDATED 12/17/2020 at 3:30PM****

Thursday, Dec. 17th: 11AM-4PM; last shot at 3:30PM
Friday, Dec. 18th: tentatively open at 7:30AM; possible delayed opening pending weather changes


Another opportunity to get free COVID-19 testing. No appointment or referral needed. All ages. Do not have to have symptoms.

[11/25/20]   Happy Thanksgiving!
The office will be closed November 26th and 27th. 11/18/2020

Loudoun County, VA

Here are Loudoun County Health Dept recommendations for college students returning home from school to reduce risk of COVID-19 transmission. Loudoun Health Officials Offer Guidance on College Students Returning Home for the Holidays


Free COVID-19 testing. All ages. No appointment necessary. No referral needed. Whether you have symptoms or not. Complete the registration paperwork before going though.

#Loudoun County will host two free COVID-19 testing events Saturday, November 21, 2020. The drive-thru events are open to all. Details here:

[11/16/20]   Just a friendly reminder that the office will be closed November 26th-27th


Thank you Northern Virginia for recognizing Dr. Yoon!


Happy Veterans Day! Thank you to all the wonderful men and women who served including our very own Dr. Yoon.


We will be closed this Friday, July 3rd for the Fourth of July holiday!

[05/27/20]   Effective Friday, May 29, 2020
Per Gov. Northam's mandate; facial coverings or masks will be REQUIRED of all patients and family members at all times in the clinic. We will also be conducting temperature and symptoms screenings of all patients.


We will be closed on Memorial Day, Monday, May 25th!


Traditionally, the peak tree pollen counts fall in between the last two weeks of April and the first two weeks of May in the Metro DC area. With all the cold wet weather we have had over the last couple of weeks, the trees in the area have not had a chance to release their pollen. Starting today, temperatures are going to be in the upper 60s and continue over the next couple of days into the 70s with generally dry conditions with a slight breeze. The weather is ideally suited for the maximum release of pollen. Don't be surprised if you wake up to your car covered in a fine yellow dust tomorrow or Sunday.
With the warmer and drier weather, people cooped up in their homes will likely venture outdoors. With the increased tree pollen in the area, those people with seasonal allergies are likely to have a significant increase in their symptoms, especially if they have not been using their allergy medications or have stopped receiving their allergy shots.
With COVID-19 also ongoing, some allergy symptoms can be confused with COVID-19 symptoms. Although both conditions can have sneezing, coughing, congestion, and shortness of breath; typically allergy symptoms are also associated with increased itchy symptoms (eyes, nose, throat, and skin), and usually are not associated with fever, chills, dark discharge, body aches, or abdominal symptoms.
We are open (albeit with extra precautions) and seeing new and established patients of all ages to help you with your seasonal and year-round allergy symptoms. Call now to schedule your appointment or to answer any questions. We also offer televist appointments if needed. or call (571) 246-6323


Found this on another page. Be careful when making homemade cleaning wipes, etc.

[04/25/20]   My staff thinks my posts are too long, so I'll keep this one simple and short.

DO NOT inject, ingest, or otherwise use cleaning products in any way other than what is listed on the directions of use. Also do not purposely expose yourself to any UV or other intense light in hopes of curing or preventing COVID-19. 04/18/2020

Is the Virus on My Clothes? My Shoes? My Hair? My Newspaper?

This article has excellent practical information and answers about questions people have about the coronavirus and how the respiratory droplets can and can not cause infection. We asked the experts to answer questions about all the places coronavirus lurks (or doesn’t). You’ll feel better after reading this.

[04/17/20]   Spring allergy sufferers, we are heading to the heart of the Spring Allergy Season. Traditionally in the Metro DC area, the peak tree pollen counts are measured anywhere between the start of the 3rd week of April to the end of the 1st week in May. A clear visual cue is the layer of yellowish film on your cars.

Normal, tree pollen is microscopic and not visible to the unaided eye without a magnifying glass or microscope. However, during the peak, there are so many pollen granules in the air that the individual pollen grains clump together so that they become visible to the naked eye. Traditionally, the biggest contributor to the pollen counts during these times is oak tree pollen. Oak pollen accounts for greater than 50% of the pollen count in any given year including trees (Spring), grasses (Summer), and weeds (Fall).

Those masks that people are currently wearing for the COVI-19, have a dual purpose now as it may help to reduce how much pollen they are exposed to when outdoors. Also remember to use your allergy medications including antihistamines pills, nasal sprays, and eye drops. Aeroallegen immunotherapy or "allergy shots" are also very effective in reducing your need for medications over time.

We are open as usual, albeit with extra COVID-19 precautions and procedures, to answer your questions, help you determine if and which environmental allergens are causing your symptoms and also to tailor a treatment plan within your budget and time constraints. We offer in-office and/or televisits for your convenience.

Call us at (571) 246-6323 or visit us at

[04/09/20]   We previously published a post about wearing masks/facial coverings in public. The CDC is now officially recommending that people should wear a facial covering when out in public, especially in public indoor areas. Again, please save the N95 and surgical masks for the healthcare personnel. Facial coverings are very effective in helping to prevent you from touching your face with contaminated hands. Social distancing and staying six feet away from those respiratory droplets will also go a long way in preventing person to person transmission.

There are a lot of people also wearing gloves. Gloves can be effective in a place like the gas station. You wear the gloves to pump gas and throw them in the trash immediately after use without touching other objects. Wearing gloves in other situations may not be ideal. Wearing gloves can give you a false sense of protection as you think you are protecting your hands but everything your gloved hand touches is potentially contaminated. If you then proceed to touch other objects (your face, phone, glasses, steering wheel, etc) those objects are now also contaminated. Replacing your gloves each time you touch something is also not practical. The best way to keep your hands clean is by frequent handwashing with soap and water. If that is not immediately available then the next best option is using hand sanitizers and/or wipes to clean off commonly touched surfaces. Remember also to decontaminate your commonly touched objects, especially your cell phone.

[04/03/20]   To mask or not to mask? There is a lot of coverage about the shortage of personal protective equipment (PPE) including N95 respirators masks and surgical masks for healthcare and other frontline personnel helping to combat COVID-19 and are directly exposed to patients with COVID-19. Recently there has also been coverage about whether or not the general public should wear masks/facial coverings when they are in public places.
First some basics about transmission. The most recent understanding among the public health officials and others monitoring the spread of COVID-19 is that COVID-19 is transmitted via contact with respiratory droplets of an infected person. This can be in the form of direct contact from an infected person who sneezes, cough, or otherwise directly exposes an uninfected person. Remember though that not every sneeze or cough from an infected person will cause transmission of the virus to the exposed person. Transmission can also occur via touching a surface that has the infected respiratory droplets then touching your own mouth, eyes, or nose. Viruses can only replicate inside a living cell, so when they are in those respiratory droplets and get on surfaces, the virus rapidly degrades. There have also been reports about how long the virus can stay on any given surface with variability depending on the surface. Anywhere from up to 72 hours on glass, steel, plastic, and countertops to up to 24 hours on cardboard, fabric, or paper. Those times should be taken in the context that although you can measure the presence of a virus on a surface it does not necessarily mean that the virus will cause disease. Quantity and how rapidly environmental factors degrade those viruses largely determines their infectivity.

Hand washing and avoiding touching your face (mouth, nose, and eyes) with social distancing and avoiding crowded public spaces is still the best guard against exposure to this coronavirus (SARS-CoV-2). That is why MD, VA, and DC and other states have stay at home orders and guidance to avoid congregating in large groups. Social distancing has worked in the past with previous pandemics and is working to reduce transmission rates during this pandemic. The stay at home orders are not an isolation order so exercising outside or taking your dog for a walk is allowed and recommended with limitations, just avoid crowds or large groups.

N95 respirator masks and equivalents really should be reserved for those healthcare workers who are treating known infected patients in hospitals and clinics. Masks and the better term facial coverings may be helpful in guarding against touching your mouth, nose, and eyes while in public and also helps reduce the spread of those respiratory droplets in asymptomatic infected persons who may be out in the public. The concern about advising all persons to wear facial coverings in public is that public health officials do not want to give the public a false sense of security that wearing a facial covering is going to absolutely protect them from contracting the virus. Wearing a facial covering in public does not negate the need to continue with frequent hand washing and social distancing practices. Any form of facial covering will work, it does not have to be a surgical mask or N95 respirator mask.

[04/02/20]   We are still open as usual for visits and allergy shots. We have been fortunate thus far that walk-in shot patients have not been coming in bunches so there are generally no more than 2-4 shot patients at any one time in the waiting room. Thus we have not had to implement scheduled shot visits yet. If you are concerned, please feel free to call ahead before coming in. We have also activated telehealth visits through our patient portal, HEALOW app. Please call if you are interested in a new or established patient visits via video conferencing. We are still working out the clinks so please be patient with us if you choose that route. Again as a friendly reminder, if you have a fever, cough, shortness of breath, cold or URI symptoms or are asymptomatic but have had contact with someone who is sick, we ask you to stay home. (571) 246-6323

A New Beginning!

Officially open for patients as of April 9, 2018!!

Welcome to Ashburn Allergy, PLLC. We are a pediatric and adult allergy, asthma, and immunology clinic located in the heart of Loudoun County. We strive to provide the most advanced and comprehensive evaluation and treatment for your entire family. We welcome patients of all ages. Here at Ashburn Allergy, every patient is cared for like family and we want you to be involved in your care and well-being. We use the most current evidence-based medical guidelines and clinically proven state of the art testing and evaluation methods to develop a personalized treatment and care plan individualized to each patient’s needs.

Jiun Yoon, MD started his own solo allergy practice, Ashburn Allergy, PLLC, after eleven years of government service and six years in a group private practice. He served nine years on active duty with the United States Army. During his distinguished nine-year Army career, Dr. Yoon served as a Brigade Surgeon in the 2nd Infantry Division, staff internist with the 8th Army based in Seoul, South Korea, and Chief of the Allergy and Immunology Service at Dwight D. Eisenhower Army Medical Center in Augusta, Georgia; including a deployment in support of Operation Iraqi Freedom with the 10th Combat Support Hospital. After completing his active duty service, Dr. Yoon practiced at the Fort Belvoir Community Hospital as a civilian allergist and also contributed to the education of future allergists at the Walter Reed National Military Medical Center Allergy and Immunology training program. Prior to starting Ashburn Allergy, Dr. Yoon joined a large group allergy private practice in the Metro DC area and served as the lead physician for their hub. He completed his undergraduate training at the University of Michigan in Ann Arbor and earned his Doctor of Medicine from the Drexel University College of Medicine in Philadelphia. He completed his internship and residency in Internal Medicine at Tripler Army Medical Center in Honolulu, HI and fellowship training in Adult and Pediatric Allergy and Immunology at the prestigious Walter Reed Army Medical Center. He is board certified in Allergy/Immunology.

Dr. Yoon's professional career includes appointments on several committees appointed by the American Academy of Allergy Asthma and Immunology (AAAAI) and the American College of Allergy Asthma and Immunology(ACAAI). He has also been elected as a Fellow of both the AAAAI and the ACAAI, as well as the American College of Physicians.




20955 Professional Plaza Ste 300
Ashburn, VA

Opening Hours

Monday 10am - 6pm
Tuesday 7:30am - 2:30pm
Wednesday 10am - 6pm
Thursday 10am - 6pm
Friday 7:30am - 2:30pm
Other Ashburn businesses (show all)
Smilez Pediatric Dental Group Loudoun Smilez Pediatric Dental Group Loudoun
24565 Dulles Landing Drive, Suite 150
Ashburn, 20166

Our practice is committed to providing you and your family with safe, gentle, and state-of-the-art dental care.

Ashburn Pain Management & Wellness Center Ashburn Pain Management & Wellness Center
20955 Professional Plaza Suite 320
Ashburn, 20147

Dr. Tara Urschel, DC is a chiropractor treating patients in the Ashburn, VA and surrounding areas.

The Loudoun Center for Plastic Surgery The Loudoun Center for Plastic Surgery
45155 Research Pl # 125
Ashburn, 20147

Aesthetic Plastic Surgery, and Reconstructive Surgery services for Northern Virginia, Loudoun and Fairfax area.

Next Health Next Health
44121 Harry Byrd Hwy, Ste 115
Ashburn, 20147

We rethink medicine aiming to find cures, pursue science & innovation while disrupting the current standard of healthcare.

Karen S Benton, DC Karen S Benton, DC
20116 Ashbrook Place Suite 140
Ashburn, 20147

It is my mission to provide better health and a better way of life through practicing the true principles of chiropractic wellness care.

Ashburn Walk-In Clinic & Primary Care Ashburn Walk-In Clinic & Primary Care
21001 Sycolin Rd
Ashburn, 20147

Walk-In Services, School & Sports Physicals, Acute illness (Flu, URI, UTI, Lyme, pneumonia, shingles), Strep, ear infections & ear aches, Sprains, Wound

Core Concepts Chiropractic By Roselle Core Concepts Chiropractic By Roselle
42882 Truro Parish Dr #207
Ashburn, 20148

Core Concepts Chiropractic by Roselle: Applied Kinesiology, Neuro Emotional Technique, Brimhall Technique, Physiotherapy

Ashburn Crossfit Ashburn Crossfit
43150 Broadlands Center Plaza, Suite 168
Ashburn, 20148

Ashburn CrossFit is for everyone, not just elite athletes. We are a complete fitness program that can be adapted for all fitness levels and ages.

Leesburg Spa Dentistry Leesburg Spa Dentistry
44790 Maynard Square, Suite 140
Ashburn, 20147

At Leesburg Spa Dentistry, we provide outstanding ethical dental care in a patient-centered environment with a gentle touch.

Ashburn Internal Medicine Ashburn Internal Medicine
21785 Filigree Ct Ste 215
Ashburn, 20147

prevention is preferable to cure

Perfectly Female Women's Health Care - Ashburn, VA Perfectly Female Women's Health Care - Ashburn, VA
20925 Professional Plz, Suite 200
Ashburn, 20147-3403

Our goal is to provide the best Obstetric and Gynecologic Care by our highly skilled professionals w

Burn Boot Camp - Ashburn Burn Boot Camp - Ashburn
44190 Waxpool Road, Suites 132-137
Ashburn, 20147

Burn Boot Camp is a fitness facility that transforms lives and communities through challenging 45-minute cardio and strength workouts.