Contact Dermatitis: Causes, Common Triggers, Symptoms and Treatment
Skin condition guide
Contact dermatitis is an itchy, red or dark, sometimes blistering rash caused by something touching the skin. There are two types: irritant contact dermatitis, from repeated damage by soaps, water or chemicals, and allergic contact dermatitis, a delayed immune reaction to a substance such as nickel or fragrance. At least 20% of people are allergic to a common contact allergen, so finding and avoiding the trigger is the most important step, followed by barrier repair and soothing care.
- Irritant type: the most common; caused by soaps, detergents, frequent handwashing and wet work.
- Allergic type: appears 1 to 3 days after contact; nickel is the top allergen (11.4% of people).
- Diagnosis: a product diary and, if needed, patch testing by a dermatologist.
- Treatment: avoid the trigger, repair the barrier, short steroid courses for flares, and gentle soothing creams.
What is the difference between irritant and allergic contact dermatitis?
| Feature | Irritant contact dermatitis | Allergic contact dermatitis |
|---|---|---|
| Cause | Direct damage to the skin barrier | Delayed immune reaction after sensitisation |
| Who gets it | Anyone, with enough exposure | Only people sensitised to that substance |
| Timing | Minutes to hours, builds with repeated exposure | Usually 1 to 3 days after contact |
| Feels like | Burning, stinging, dryness, cracks | Intense itch, sometimes blisters |
| Common causes | Soap, detergent, sanitiser, solvents, wet work | Nickel, fragrance, preservatives, hair dye, rubber |
What are the most common contact allergens?
A meta-analysis found at least 20% of the general population are allergic to a common environmental allergen (Alinaghi et al., 2019):
- Nickel (11.4%): jewellery, belt buckles, watch backs, phones
- Fragrance mix (3.5%): perfumes, skincare, essential oils
- Cobalt (2.7%) and chromium (1.8%): metals, leather, cement
- Balsam of Peru (1.8%): fragrances and flavourings
- PPD (1.5%): dark hair dyes and black henna
- Isothiazolinone preservatives (1.5%): wipes, cosmetics, cleaning products
- Colophonium (1.3%): adhesives and plasters
Essential oils such as tea tree are also recognised triggers; see tea tree oil and eczema.
What are the symptoms, and what does the location tell you?
Symptoms include itch, burning, redness (or darker patches on brown skin), swelling, dryness, cracking and sometimes small blisters. The location is a strong clue:
- Earlobes, wrist, navel: nickel in jewellery, watches or jeans studs
- Eyelids: nail polish, cosmetics or things transferred by the hands
- Hairline and scalp edge: hair dye or hair products
- Armpits and neck: deodorant and fragrance
- Hands: soaps, wet work, gloves and workplace chemicals; see the European hand eczema guideline (Thyssen et al., 2022); read the full hand eczema guide
Contact dermatitis can look like other eczema types; compare them in our guide to types of eczema.
How do you find the cause?
- Keep a diary of products, jobs, hobbies and where the rash appears. Allergic rashes are delayed, so the last product used is not always the culprit.
- Do a use test of a suspect product on the inner arm for 7 to 10 days.
- Ask about patch testing. Diagnosis of allergic contact dermatitis is based on history, examination and patch testing, and the mainstay of treatment is avoiding the allergen (Nassau and Fonacier, 2020).
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How is contact dermatitis treated?
- Avoid the trigger. This is the single most effective step.
- Repair the barrier with fragrance-free moisturisers, applied often, especially after handwashing. Moisturisers reduce flares and the need for steroid creams (van Zuuren et al., 2017).
- Protect your hands with cotton-lined gloves for wet work, and use lukewarm water.
- Short steroid courses for flares, as your doctor advises; long-term steroid use should be avoided (Nassau and Fonacier, 2020).
- Cool the itch with cold compresses or a cooling, steroid-free cream once the rash has settled, after a patch test.
Because any ingredient can be an allergen for someone, choose products with a short, fully declared ingredient list. If you have known reactions to menthol, mint or camphor-type ingredients, check labels carefully; see QICAOGANGMU safety.
When should you see a doctor?
- The rash is widespread, on the face or genitals, or blistering
- It keeps coming back and you cannot find the cause
- It affects your work, for example in healthcare, hairdressing or cleaning
- Signs of infection: pus, crusting, spreading warmth or fever
Where QICAOGANGMU fits
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Patch test on a small area first, use a thin layer on intact skin and avoid the eyes, lips and genitals. Hand eczema · Product details
Frequently asked questions
What is the most common cause of contact dermatitis?
Irritants such as soap, detergent and frequent handwashing cause most cases. Nickel is the most common allergen, affecting about 11% of people.
How long does contact dermatitis last?
Once the trigger is avoided, it usually settles within 2 to 4 weeks. It can return quickly if you are exposed again.
Is contact dermatitis contagious?
No. It is a reaction to something that touched your skin and cannot spread to other people.
How do I find out what I am allergic to?
Keep a product diary and ask a dermatologist about patch testing, which tests your skin against common allergens over several days.
What cream is best for contact dermatitis?
Fragrance-free moisturisers for barrier repair, short courses of a doctor-recommended steroid for flares, and a gentle steroid-free cream for lingering itch after a patch test.
Related articles
References
- Alinaghi F, Bennike NH, Egeberg A, et al. Prevalence of contact allergy in the general population: a systematic review and meta-analysis. Contact Dermatitis. 2019;80(2):77-85. PMID 30370565
- Thyssen JP, Schuttelaar MLA, Alfonso JH, et al. Guidelines for diagnosis, prevention, and treatment of hand eczema. Contact Dermatitis. 2022;86(5):357-378. PMID 34971008
- Nassau S, Fonacier L. Allergic contact dermatitis. Med Clin North Am. 2020;104(1):61-76. PMID 31757238
- van Zuuren EJ, Fedorowicz Z, Christensen R, et al. Emollients and moisturisers for eczema. Cochrane Database Syst Rev. 2017;2:CD012119. PMID 28166390
Product information. This article is educational. QICAOGANGMU is a topical herbal skin-care cream; widespread, blistering or recurrent rashes should be assessed by a healthcare professional.
