[Temporary tatooing: black henna or harkous?].

Area of Science:

• Dermatology
• Allergology
• Toxicology

Background:

• Natural henna (Lawsonia inermis) is traditionally used as a skin dye with rare reports of sensitization.
• Temporary tattoos, often marketed as "black henna," have been associated with adverse reactions.
• Paraphenylenediamine (PPD) is a known allergen found in some hair dyes and temporary tattoo formulations.

Observation:

• This study presents 8 cases (4 children, 4 adults) of contact dermatitis following temporary tattoos using "harkous."
• "Harkous" was identified as a mixture of nut gall and clove, sometimes containing PPD.
• None of the "harkous" products used in these cases contained natural henna.

Findings:

• All 8 patients developed allergic contact dermatitis attributed to the "harkous" temporary tattoos.
• The presence of PPD in the "harkous" mixture is strongly suspected as the causative agent.
• This highlights the risk of PPD sensitization from non-henna-based temporary tattoos.

Implications:

• Healthcare providers should be aware of PPD as a potential allergen in "black henna" and other temporary tattoo products.
• Public awareness regarding the risks associated with temporary tattoos, especially those containing PPD, is crucial.
• Further investigation into the composition and regulation of temporary tattoo dyes is warranted to prevent allergic reactions.