Excessive sweating (associated with dysfunction of the sweat glands),

Contact with allergens (nickel, chromium, cleaning products, cosmetics),

Psychological stress (aggravates symptoms),

Fungal infections (e.g. in people with athlete’s foot),

Atopy (50% of patients also suffer from atopic dermatitis or allergic rhinitis).

3. Diagnosis
Dermatological examination (characteristic appearance of the lesions),

Patch tests (exclusion of contact allergy),

Mycological examination (exclusion of mycosis),

Skin biopsy (in case of doubt).

4. Treatment