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In fact, the concentration of PPD in black henna is higher than that seen in commercial hair dyes. After resolution of the eczematous skin eruption, postinflammatory hyperpigmentation may persist for a considerable period of time. Source: Allergic and Irritant Contact Dermatitis, Weinberg's Color Atlas of Pediatric Dermatology, 5e Citation: Prose NS, Kristal L. Weinberg's Color Atlas of Pediatric Dermatology, 5e; 2017 Available at: Accessed: January 12, 2018 Copyright © 2018 McGraw-Hill Education. All rights reserved
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