Skin Allergy Testing in Sharjah

What is skin allergy testing?

Skin allergy testing at a dermatology clinic means patch testing, a test for allergic contact dermatitis. This is a delayed allergy: the immune system reacts to a substance touching the skin, and the rash appears a day or more after contact, so the cause is hard to spot from memory. Patch testing reproduces that reaction on a small, controlled area, which shows the trigger.

Patch testing answers a different question from other allergy tests on this site.

| Test | Allergy type | Typical question |
|---|---|---|
| Skin allergy patch testing (this page) | Delayed contact allergy | What in my products, jewellery or work is causing this rash? |
| Nasal allergy testing | Immediate allergy | What triggers my sneezing and blocked nose? |
| Child allergy testing | Mainly immediate allergy | Is my child allergic to a food or airborne trigger? |

At Dar Al Kamal Hospital, Sharjah, patch testing is arranged by the dermatology team, who choose the allergens, read the results and explain what they mean for your daily routine.

Who needs it

Patch testing suits people with a rash in a telling pattern: eyelids, earlobes, under a watchstrap or belt buckle, on the hands, around the mouth, along the hairline, or at the site of a cream. It also suits eczema that keeps returning despite good treatment, a reaction after hair dye or henna, and work-related hand rashes.

Common culprits include nickel in jewellery and buckles, fragrance, preservatives in cosmetics and wet wipes, hair dye chemicals, rubber in gloves, chromate in cement, and ingredients in medicated creams. Black henna, often used in the UAE for body art, can contain a hair-dye chemical that sensitises the skin for life.

What happens

Patch testing usually needs three short visits in one week.

1. Application. The skin of your upper back is cleaned, and strips holding small chambers are applied. Each chamber carries a tiny amount of one allergen from a standard series, plus extra series chosen for your job or products. Your own products can be tested where safe. The positions are marked on your skin.
2. First reading. A couple of days later, the patches are removed and the marked sites are examined.
3. Final reading. A few days after application, the sites are read again, because some allergens take longer to react.

Each reaction is graded by how red, raised or blistered it looks. The dermatologist then decides which positive results are relevant to your rash, by matching each allergen to what your skin actually touches. A positive result that explains the pattern of your rash is the useful finding.

You leave with a written list of your allergens, their other chemical names, and the product types where they hide.

Preparing for it

Keep your back free of steroid creams and strong sun exposure for the weeks before the test, as advised, because both can dampen reactions. Tell the team if you take steroid tablets or medicines that calm the immune system. Antihistamine tablets can usually be continued, since they have little effect on this type of allergy.

Bring the products you use, in their original packaging, including skincare, makeup, hair products, perfume, and gloves or materials from work. Wear an old dark top on the days of testing, since marker ink can transfer to clothing.

Plan the week carefully. The patches must stay dry, so you will need to avoid showering the back, swimming, gym sessions and heavy sweating during testing. In the Sharjah summer, choose a week with less outdoor work, and let the team know if you plan to fast during Ramadan so the visits fit your day.

Afterwards

Mild itching at a positive site is normal and settles over the following days. Wash the marker away after the final reading. Some reactions appear late, so check your back for a week or so afterwards and photograph any new red patch.

Avoiding your allergens is the treatment. Read ingredient labels using the names on your results list, choose fragrance-free and preservative-appropriate products, and cover nickel buckles and buttons. Your rash is then managed through eczema and psoriasis treatment while the skin recovers.

Contact the hospital if a patch site blisters, becomes very painful or spreads beyond the test area. **Go to the emergency department straight away if you develop swelling of the lips, tongue or throat, or difficulty breathing, and remove the patches.**

Cost and insurance

Most UAE insurance plans cover patch testing when it is requested for a diagnosed rash such as suspected contact dermatitis or hand eczema, and many need pre-approval with the clinic's referral. Extended series or testing of your own products may be covered in part. Work-related testing is sometimes covered by an employer. Dar Al Kamal Hospital, Sharjah can help you check your cover on 06 599 7777.