“…Whereas contact allergy to henna itself seems to be rare, additives are added to make the process faster and to obtain a darker pigment, particularly paraphenylenediamine, a strongly allergenic permanent hair dye, the concentration of which may be very high, even though the use of diaminobenzene derivatives is forbidden for dying skin [12]. The eczematous reactions may be long-lasting and present as erythema exsudativum multiforme-like or lichenoid reactions, or produce depigmentation [19,20] or hyperpigmentation, and even as hypertrophic scars [21]. Such allergies may have consequences for the future of these children as certain professions become risky, for instance hairdressing, and clothing dyed with azo or disperse dyes, which are cross-reacting chemicals, may become responsible for textile dermatitis.…”