Temporary Black Henna Tattoos as a Cause of Contact Dermatitis and Localized, Self-Limiting Hypertrichosis – Three Case Reports

Introduction. Temporary black henna tattoos are highly popular among children and adolescents, especially during summer festivals and holidays. Since natural henna dries slowly and provides limited pigment intensity, various additives are incorporated to enhance its properties. This leads to the production of black henna, which most commonly contains para-phenylenediamine, a well-known contact allergen capable of inducing numerous adverse skin reactions.

Case Reports. We report three pediatric cases of contact dermatitis accompanied by self-limiting localized hypertrichosis following temporary black henna tattoos. In all patients, clinical examination revealed contact dermatitis lesions precisely matching the shape of the previous tattoo, along with localized terminal hair growth in the same area. Short courses of topical corticosteroids resulted in regression of inflammatory lesions, while hyper-trichosis resolved spontaneously within three months.

Discussion. The hypertrichosis observed after black henna tattooing may be interpreted as a potential adverse effect of topical corticosteroid therapy. However, in one patient corticosteroid therapy was minimal, and in two patients hypertrichosis was already present upon initial examination, together with contact dermatitis. Furthermore, isolated hypertrichosis without contact dermatitis has been previously described in the literature.

Conclusion. Self-limiting localized hypertrichosis is a rare but clinically relevant complication of temporary black henna tattoos. Given the growing popularity of henna for decorative purposes, these cases underline the need for greater awareness of possible adverse reactions and for appropriate patient education. Reassurance is typically sufficient