16 citations
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February 2001 in “PubMed” Allergic scalp reactions can cause temporary hair loss.
98 citations
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November 2002 in “Contact Dermatitis” Many people had severe allergic reactions to a common hair dye ingredient, causing them to seek medical care and miss work.
16 citations
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April 2000 in “Contact dermatitis” A man developed severe skin reactions after using a treatment for hair loss.
8 citations
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February 2022 in “Journal of The American Academy of Dermatology” Oral minoxidil is a reasonably safe alternative for patients allergic to the topical form.
April 2007 in “The FASEB Journal” Henna mixed with PPD can cause skin reactions, scarring, and a specific type of baldness, and needs more research to understand these effects.