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
”
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Studysummary This study observed an unexpected case where a 44-year-old woman developed linear scalp pigmentation, resembling a tattoo, after undergoing a microneedling procedure followed by hair dyeing two days later, emphasizing the need to advise patients on avoiding hair dye application soon after such treatments. Our plain-language summary of this paper — not a Tressless recommendation.
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.
