
This case series investigates the use of mesenchymal stem cell (MSC) exosomes for treating acquired trichorrhexis nodosa (ATN), a condition causing hair shaft abnormalities and breakage. Three patients were treated with monthly exosome injections (5 mL total) into their scalps for at least four sessions. Post-treatment evaluations, including clinical photographs, dermatoscopy, and scanning electron microscopy (SEM), showed significant improvement in hair length, density, pigmentation, and reduced hair breakage. Dermoscopic analysis revealed the disappearance of black dots and broken hairs, while SEM showed recovery in hair cuticle layers. At the 1-year follow-up, hair growth remained normal.
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