Skin Allergy Testing Explained
Know what is skin allergy, testing, its significance, types of skin allergy test, who should get tested, how to do it and what happens after the test. Learn how to manage their allergies.
Introduction
Allergies can be frustrating and uncomfortable, especially when you don’t know what’s causing them. If you've been dealing with unexplained rashes, itching, or swelling, skin allergy testing might help identify the triggers. This guide will explain what skin allergy testing is, how it works, and what you can expect from the process.
What Is Skin Allergy Testing?
Skin allergy testing is a simple and effective way to determine what substances (allergens) cause allergic reactions in your body. By exposing your skin to small amounts of common allergens, doctors can observe how your skin reacts and pinpoint the exact cause of your allergy.
Why Is It Done?
It is done for below reasons:
- To diagnose allergies causing skin reactions (rashes, hives, eczema).
- To identify triggers for hay fever (allergic rhinitis) or asthma.
- To determine food allergies (though additional tests may be needed).
- To help create a personalised allergy management plan.
Consult a top general practitioner for the best advice
Types of Skin Allergy Tests
There are three main types of skin allergy tests:
1. Skin Prick Test (SPT)
- How it works: A tiny drop of allergen extract is placed on your skin (usually the forearm or back). A small needle gently pricks the skin to allow the allergen to enter.
- What to expect: If you're allergic, a small raised bump (like a mosquito bite) will appear within 15-20 minutes.
- Best for: Testing pollen, dust mites, pet dander, mould, and some food allergies.
2. Intradermal Test
- How it works: A small amount of allergen is injected just beneath the skin.
- What to expect: More sensitive than the prick test, often used if the prick test is negative, but allergies are still suspected.
- Best for: Detecting drug or insect sting allergies.
3. Patch Test
- How it works: Allergens are applied to patches, which are taped to your skin (usually the back) for 48 hours.
- What to expect: Reactions (redness, itching, or blisters) develop slowly, so you’ll return to the doctor after 2-3 days.
- Best for: Diagnosing contact dermatitis (allergies to metals, fragrances, latex, or chemicals).
Who Should Get Tested?
You may need skin allergy testing if you experience:
- Frequent sneezing, runny nose, or itchy eyes
- Skin rashes, hives, or eczema flare-ups
- Swelling or itching after eating certain foods
- Breathing difficulties (wheezing, asthma-like symptoms)
- Reactions to insect stings or medications
Note: If you have severe eczema, take antihistamines, or have a history of severe allergic reactions (anaphylaxis), inform your doctor before testing.
How to Prepare for the Test?
The test preparation is done by the below ways:
- Avoid antihistamines (allergy medications) for 3-7 days before testing, as they can interfere with results.
- Inform your doctor about any medications you’re taking.
- Wear loose clothing if testing is done on your back.
- Stay relaxed—the test is quick and minimally uncomfortable.
What Happens After the Test?
Follow things may happen after the test:
- Positive reaction: A red, itchy bump (wheal) appears, confirming an allergy.
- Negative reaction: No reaction means you’re likely not allergic to that substance.
- Your doctor will discuss the results and recommend:
- Avoiding allergens
- Medications (antihistamines, nasal sprays)
- Allergy shots (immunotherapy) for long-term relief
Managing Allergies After Testing
Once you know your triggers, you can take steps to reduce exposure:
For Pollen/Dust Allergies:
- Keep windows closed during high pollen seasons.
- Use air purifiers and wash bedding frequently.
- Shower after being outdoors.
For Food Allergies:
- Read food labels carefully.
- Carry an epinephrine auto-injector if at risk of severe reactions.
For Skin Allergies (Contact Dermatitis):
- Avoid irritants like nickel, fragrances, or latex.
- Use hypoallergenic skincare products.
When to See a Doctor?
If allergy symptoms interfere with daily life or cause severe reactions (trouble breathing, swelling), consult an allergist. Apollo 24|7 offers expert allergy testing and consultations—book an appointment easily online!
Final Thoughts
Skin allergy testing is a safe, quick, and reliable way to identify what’s causing your allergic reactions. Once you know your triggers, you can take control of your allergies and live more comfortably.
Consult a top general practitioner for the best advice
Consult a top general practitioner for the best advice
Dr Syed Mateen Pasha
General Physician
2 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Syed Ismail Ali
General Practitioner
7 Years • MBBS
Hyderabad
Apollo 24|7 Clinic, Hyderabad
Dr. Bhukya Pavan Kalyan
General Physician
5 Years • MBBS DNB Paediatrics
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Anand Ravi
General Physician
2 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Madhuri Sai Sreepada
General Practitioner
9 Years • MBBS
Hyderabad
BRIGHT SMILES MEDICARE & DENTAL CARE, Hyderabad
Consult a top general practitioner for the best advice
Dr Syed Mateen Pasha
General Physician
2 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Syed Ismail Ali
General Practitioner
7 Years • MBBS
Hyderabad
Apollo 24|7 Clinic, Hyderabad
Dr. Bhukya Pavan Kalyan
General Physician
5 Years • MBBS DNB Paediatrics
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Anand Ravi
General Physician
2 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Madhuri Sai Sreepada
General Practitioner
9 Years • MBBS
Hyderabad
BRIGHT SMILES MEDICARE & DENTAL CARE, Hyderabad
