Allergic contact dermatitis from temporary henna tattoo

Area of Science:

• Dermatology
• Allergology
• Toxicology

Background:

• Temporary henna tattooing is a popular cosmetic practice.
• Henna dye, derived from Lawsonia inermis, is often mixed with para-phenylenediamine (PPD) to achieve a black color and faster dyeing.
• Para-phenylenediamine (PPD) is a known potent contact sensitizer.

Observation:

• A case study involving a 9-year-old boy who developed allergic contact dermatitis.
• The allergic reaction was linked to a temporary henna tattoo.
• Patch testing confirmed a positive reaction specifically to PPD.

Findings:

• The patient presented with symptoms of allergic contact dermatitis.
• Diagnosis was confirmed via patch testing, identifying PPD as the allergen.
• Treatment involved topical corticosteroids and oral antihistamines.

Implications:

• Highlights the potential risks associated with PPD in temporary henna tattoos.
• Underscores the importance of accurate allergen identification in pediatric dermatology.
• Suggests that while effective treatments exist, residual hypopigmentation may occur.