Complication following treatment with a microneedling technique for a female pattern hair loss: hair dye-induced tattoo-like pigmentation

Microinfusion of drugs into the skin (MMP ) is a Brazilian microneedling technique that employs professional tattoo devices for the delivery of pharmacological agents in conditions such as female pattern hair loss.We report an unexpected complication in a 44-year-old female patient who underwent hair dyeing 2 days after the procedure and subsequently developed linear pigmentation on the scalp resembling a tattoo.Trichoscopy revealed pigment deposition at the needle entry points, likely resulting from penetration of the hair dye.Although adverse effects of MMP are generally mild, this case highlights the importance of counseling patients regarding the use of hair dye following the procedure.