Introduction
They are most often delayed allergic reactions, appearing 24 to 72 hours after contact, which can make the cause difficult to identify.
Symptoms
- Skin redness
- Itching
- Blisters or oozing
- Peeling
- Localised swelling
- Hands
- Face and eyelids
- Neck
- Forearms
Causes
- Cosmetics (fragrances, preservatives, dyes)
- Household products (detergents, cleaning products)
- Industrial and occupational products
- Topical medicines
- Hair products (hair dyes, shampoos)
- Perfumes and fragrances
- Preservatives
- Disinfectants
- Resins, glues
- Dyes
- Repeated exposure
- High-risk occupation
- Damaged skin barrier
- Using several products at the same time
Diagnosis
- A detailed medical history
- Review of the products used (reading ingredient lists / INCI)
- Clinical examination
- Patch testing with series tailored to the suspected chemicals
Treatments
- Strict avoidance of the substance responsible
- Stopping or replacing the products involved
- Appropriate topical treatments depending on severity
- Repairing skincare to restore the skin barrier
Management
Precise identification of the allergenic substances
Clear advice on avoidance and substitutes
Adapting the products you use at home or at work
Dermatological and allergy follow-up if needed