(Reuters Health) – Hairdressers may have skin damage from a hair dye ingredient even when they don’t have dermatitis, or rashes, from this exposure, a small lab experiment suggests.

The chemical, p-phenylenediamine (PPD), “is a strong contact allergen used in hair dye known to cause allergic contact dermatitis,” Dr. Cezmi Akdis, of the Swiss Institute of Allergy and Asthma Research in Davos Platz, and colleagues write in the Journal of Allergy and Clinical Immunology.

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