Complication Following Treatment With a Microneedling Technique for Female Pattern Hair Loss: Hair Dye-Induced Tattoo-Like Pigmentation

    March 2026 in “ Portuguese Journal of Dermatology and Venereology ”
    Anne K. Leroy, Flavia Oliveira-Xavier-de Brito, Rita F. Cortez-de Almeida, Daniel Fernandes-Melo
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    TLDR Avoid hair dye after microneedling to prevent scalp pigmentation.
    A 44-year-old female patient experienced an unexpected complication after undergoing a microneedling technique known as Microinfusion of drugs into the skin (MMP®) for female pattern hair loss. Two days post-procedure, she dyed her hair and developed linear pigmentation on her scalp that resembled a tattoo. Trichoscopy indicated that the pigmentation was due to hair dye penetrating the needle entry points. This case underscores the need for patient counseling on avoiding hair dye shortly after undergoing MMP® to prevent such complications.
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