Contact dermatitis — rash where something touched your skin — has two types: allergic (immune response) and irritant (direct chemical damage). Patch testing distinguishes them and identifies specific allergens. Treatment is built around trigger avoidance + barrier repair.
Common triggers we identify
- Nickel — jewellery, watch backs, jeans buttons
- Fragrance — perfumes, scented products, essential oils
- PPD (hair dye)
- Cosmetic preservatives (formaldehyde-releasers, MI/MCI)
- Latex, rubber accelerators
- Detergents, cleaning products (irritant)
For broader skin allergy info see skin allergy. Book a consultation for patch testing or assessment.
Contact Dermatitis — FAQ
Allergic vs irritant contact dermatitis?
Allergic: immune response to specific allergen (nickel, fragrance, hair dye). Irritant: direct skin damage from harsh chemicals (detergents, solvents). Patch testing distinguishes them.
What is patch testing?
30-50 standardised allergens applied to back for 48 hours. Reactions identify specific contact allergens. Useful for chronic unexplained dermatitis. Available at our clinic.
Common allergens to watch for?
Nickel (jewellery), fragrance, preservatives in cosmetics, hair dye (PPD), latex, leather. We see all of these regularly.
Treatment?
Identify and avoid trigger (most-important step). Topical anti-inflammatory (steroid, calcineurin inhibitor) for acute flare. Barrier repair with ceramide moisturiser.
Will it go away if I avoid the trigger?
Usually within 2-4 weeks. Chronic exposures may take longer. Sensitisation is permanent — once allergic, always allergic to that specific allergen.
