15 citations
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June 2015 in “F1000Research” Psoriasis may be chronic because it lacks certain immune system controls that prevent overreaction.
6 citations
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January 2016 in “Indian Journal of Dermatology Venereology and Leprology” Most hair dyes can cause allergic reactions, so test before use.
12 citations
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June 2010 in “Journal of dermatology” Some patients with severe alopecia areata developed skin darkening from their treatment, which may indicate a less effective response to the therapy.
March 2026 in “Indian Dermatology Online Journal” Hair dye ingredient PPD can cause severe allergic reactions, including facial swelling.
15 citations
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July 2002 in “Australasian Journal of Dermatology” Two plywood factory workers developed contact dermatitis from phenol-formaldehyde resin, a known allergen.