Article: Allergic contact dermatitis to paraphenylendiamine in hair dye after sensitization from black henna tattoos: a report of 6 cases

TEACHING CASE REPORT

The cases: Over a 2-year period, 6 women have come to our dermatology clinic with an allergic contact dermatitis to paraphenylendiamine (PPD) from hair dye after being previously sensitized to PPD from black henna tattoos. These patients, 14-38 years and previously healthy, all reported similar stories of developing erythema, edema and pruritus in some combination of their scalp, hairline, eyelids or cheeks, 1-2 days after having their hair dyed. All had previously had at least 1 black henna tattoo; 4 of them also reported having a previous local allergic reaction to a black henna tattoo.

When patch testing was performed to identify causative allergens, all 6 patients ...

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