Patch Testing San Antonio

Patch Testing
San Antonio

Find Out What’s Really Irritating Your Skin

You’ve switched soaps, changed your laundry detergent, stopped wearing your favorite jewelry, and the rash keeps coming back. You’ve been treating the symptoms for months but nobody has told you what’s actually causing them. You’re not looking for another cream. You’re looking for an answer.

Patch testing at Juniper Allergy in San Antonio identifies the exact substances your skin is reacting to. Dr. Amanda Trott-Gregorio will pinpoint your contact allergens precisely, so you can stop guessing, stop rotating products, and start healing for good.

☎ (210) 888-1297

Dr. Amanda Trott-Gregorio

Dr. Amanda Trott-Gregorio is a board-certified Allergist/Immunologist who has been in private practice in San Antonio for the past 10 years. Her personable demeanor and passion for resolving allergies has transformed the lives of countless patients.

A native of south Texas, Dr. Amanda Trott-Gregorio graduated from Texas A&M University in 2001. She received her MD from St. George’s University School of Medicine (2003-2007). She completed her residency training at UTMB in Galveston (2007-2010) and Allergy and Immunology fellowship training at Washington University in St. Louis (2010-2012).

Dr. Amanda Trott-Gregorio had the opportunity to learn from some of the most accomplished Allergists and Immunologists in the world at St. Louis Children’s Hospital and Barnes Jewish Hospital. Her research data has been published in peer-reviewed journals and she has written chapters in The Washington Manual and Nelson’s Textbook of Pediatrics. Dr. Amanda Trott-Gregorio is a fellow of the American College of Allergy, Asthma and Immunology.

Insurance We Accept

Insurance We Accept

What Is Patch Testing?

Allergy patch testing on a patient’s back during a clinical skin allergy assessment.

Patch testing is a specialized allergy test designed to identify contact allergies, the delayed skin reactions triggered when your skin comes into direct contact with a specific substance. Unlike standard allergy testing which looks for airborne or food triggers, patch testing focuses specifically on delayed allergic reactions to things like metals, fragrances, preservatives, hair dye chemicals, rubber, and workplace substances.

During the test, small amounts of common contact allergens are placed into individual chambers, securely applied to your back with adhesive tape, and left in place for 48 to 72 hours. You’ll return to the clinic to have the patches removed, and again on the fifth day (around the 96-hour mark) so Dr. Trott-Gregorio can carefully re-evaluate your skin. It is considered the gold standard diagnostic test for contact dermatitis and one of the most valuable tests for anyone dealing with a recurring skin rash that hasn’t responded to standard treatment.

Common Substances Tested During Patch Testing

✓ Detergents and soaps

✓ Cosmetics and makeup

✓ Hair dyes and hair products

✓ Metals (including nickel and chrome)

✓ Leather and leather tanning agents

✓ Latex and rubber components

✓ Various medications

✓ Preservatives

✓ Fragrances

✓ Dental care products

✓ Fragrances

✓ Certain foods

How We Conduct A Patch Test

1

Preparation

Stop oral steroids for at least 5 days before and during testing, and avoid topical steroids on the test area.

2

Patch Application

Dr. Trott-Gregorio applies allergens in individual chambers, secured to your back with adhesive tape for 48 to 72 hours.

3

First Reading

You’ll return after 48 hours to have the patches removed, with each site carefully evaluated for redness or reaction.

4

Second Reading (Day 5)

Come back on day 5, around 96 hours in, so Dr. Trott-Gregorio can re-check your skin for delayed reactions.

Hear It from Our Happy Patients!

    
 
 
       Posted on Google  
   
   Jennifer Bailey 
 
 
 
 Trustindex verifies that the original source of the review is Google. It’s refreshing to see a doctor (and all of her staff) who show such compassion and caring for their patients. Highly recommended Dr. Trott!
  
 
      Posted on Google  
   
   Sue Palitza 
 
 
 
 Trustindex verifies that the original source of the review is Google. I really enjoyed meeting Dr. Trott and her staff.  Everyone was very nice and professional.  Dr. Trott was very knowledgeable, listened to your concerns, and made you feel comfortable. When you leave, you feel comfortable that she can help you with any issues you are having. Excited to have her as one of my new doctors!
  
 
      Posted on Google  
   
   Leslie Sebastian Sanchez 
 
 
 
 Trustindex verifies that the original source of the review is Google. My experience was Wonderful from the initial phone call to when I walked out the door . Dr. Trott listened to me and didn’t rush me along. She has such a calming presence and just made me feel like I was right where I needed to be . It was very thorough and not just a one size fits all place . The whole office staff was kind as well . If you are looking for an allergist /immunologist, look no farther than Juniper Allergy . I’m so happy I found Dr. Trott .
  
 
      Posted on Google  
   
   William Griffenberg 
 
 
 
 Trustindex verifies that the original source of the review is Google. She is if not the best one of the best doctors I have ever met and I am old so I have seen a lot.
  
 
      Posted on Google  
   
   Morgan Loudenslager 
 
 
 
 Trustindex verifies that the original source of the review is Google. Dr. Trott is worth the wait! She’s personable, doesn’t make you feel rushed and listens to your concerns. Very kind and helpful!
  
 
      Posted on Google  
   
   A B 
 
 
 
 Trustindex verifies that the original source of the review is Google. This review has been a long time coming. Everyone here at Juniper has been literally amazing!  That said, every.single.staff member at Juniper Allergy has been very welcoming since I transferred here.

Honestly, out of all the doctors and medical facilities I have been a patient of (and I see quite a bit more doctors than your average person would), I could not think of a more welcoming place to be a patient other than Juniper Allergy.

Edit: I do want to thank Dr. Trott for her advocacy of all her patients ... including myself here. She is one of the very few doctors who has shown exemplary compassion and empathy to provide the best service for her patients. I want to express that I would not be here today had I not received the type of care she has given me for my mast cell activation disorder. So to me she is the equivalent of a superhero. As cliche as that sounds, it is probably easier to just say that she is my lifesaver and I don't think I can name any other doctor with this type of regards.

-Adam B.
  
 
      Posted on Google  
   
   Evie Zambrana 
 
 
 
 Trustindex verifies that the original source of the review is Google. U simply LUV Juniper Allergy! When I first began attending, I thought it would be a miserable experience. Well, I was dead wrong! The employees were ALL so friendly, courteous, professional & extremely caring. They answer all my questions in a way that’s comprehensible. I consider my allergy injections “tender shots” that are improving my health. Thank you, Juniper!!

Why Choose Juniper Allergy For Patch Testing in San Antonio



Board-Certified Allergist

Our board-certified Allergy and Immunology specialists deliver expert, evidence-based care focused on accurate diagnosis and effective, long-term treatment.



Over 13 Years of Trusted Care

For more than 13 years, Juniper Allergy has proudly provided comprehensive allergy and immunology services to patients and families throughout San Antonio.



Personalized Treatment

We create customized treatment plans based on your unique symptoms, medical history, and health goals to achieve the best possible outcomes.



Patient-Centered Care

Your comfort and wellbeing come first. We take the time to listen, answer your questions, and build lasting relationships so you always feel supported throughout your care.

Conditions Diagnosed By Patch Testing

Contact Dermatitis

An inflamed, itchy rash that flares up when your skin comes into direct contact with allergens like nickel, fragrance, or common preservative ingredients.

Occupational Dermatitis

Skin reactions developed through on-the-job exposures, frequently seen in healthcare workers, hairstylists, mechanics, cleaners, and tradespeople in the construction industry.

Cosmetic Dermatitis

Redness, breakouts, or irritation caused by skincare products, makeup, hair treatments, or fragrances that contain hidden ingredients your skin reacts to.

Eyelid Dermatitis

Puffiness, flaking, or persistent itching around the eye area, often traced back to eye makeup, nail polish transfer, or facial cleansers.

Hand Eczema

Ongoing dryness, painful cracking, or blistering on the hands triggered by repeated exposure to soaps, gloves, sanitisers, or harsh chemicals.

Shoe Dermatitis

Itchy, scaly patches on the feet caused by rubber components, leather tanning chemicals, adhesives, or dyes used in the construction of footwear.

Your Skin Won’t Heal Until You Find the Trigger

Book An Appointment

☎ (210) 888-1297

Frequently Asked Questions

How much does patch testing cost in San Antonio?

Cost depends on the allergen panels needed and your insurance coverage. Most plans cover medically necessary patch testing. Call us at (210) 888-1297 before your appointment and our team will walk you through your costs clearly.

Is patch testing painful?

Patch testing is not painful. There are no needles, no scratching, and no injections involved. You may feel mild itching at a test site during the 48 to 72 hours the patches are on, which simply means your skin is responding to something worth investigating.

Is patch testing the same as a regular allergy test?

No, they test for completely different reactions. Standard allergy testing identifies IgE-mediated allergies like hay fever or food allergies. Patch testing identifies delayed hypersensitivity reactions responsible for contact dermatitis, making it the right test for recurring skin rashes caused by things you touch.

Can I shower or exercise during the 48 to 72 hours the patches are on?

Keep your back completely dry and avoid heavy sweating. That means no swimming, no intense exercise, and extra care while showering. Our team will give you specific practical guidance at your appointment so you know exactly what to do.

Do I need to stop any medications before patch testing?

Yes, you’ll need to stop oral steroids for at least 5 days before your test and throughout the testing period, and avoid applying topical steroids to your back or the test area. These medications can interfere with accurate results. Our team will give you clear guidance when you book your appointment.

Patch Testing San Antonio