Post-inflammatory pigmentation after reacting to paraphenylenediamine (PPD) in a temporary 'henna' tattoo
Keywords: Contact allergy, Forearm, Henna tattoo reaction, Hyperpigmentation, Paraphenylenediamine allergy, Post-inflammatory pigmentation, Skin of colour
Allergic contact dermatitis is a form of dermatitis/eczema caused by an allergic reaction to a material, called an allergen, in contact with the skin. The allergen is harmless to people that are not allergic to it. Allergic contact dermatitis is also called contact allergy.
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Source: Dr Ian Coulson
