Platelet-rich Plasma Intradermal Injection Combined With 308 nm Excimer Light for Treating Stable Acral Vitiligo

Overview

The goal of this clinical trial is to learn if platelet-rich plasma (PRP) works to treat acral stable vitiligo in adults. It will also learn about the safety of platelet-rich plasma. The main questions it aims to answer are: * Does PRP combined with 308 nm excimer phototherapy improve the efficacy compared to 308 nm excimer light alone in the treatment of vitiligo of the extremities? * What medical problems do participants have when taking PRP intradermal injections? Researchers will compare PRP to a placebo (a look-alike substance that contains no drug) to see if PRP works to treat acral vitiligo. Participants will: * Receive PRP intradermal injections once a month and 308 nm excimer phototherapy twice a week, or the same frequency of saline injections and phototherapy for 6 consecutive months * Visit the clinic once every 1 month for evaluations * Keep a diary of their symptoms or side effects during follow-up

Vitiligo is an acquired skin disorder characterized by depigmented macules, and one of the conventional treatment principles is to promote the differentiation of stem cells at the follicular bulge into melanocytes, but vitiligo of the extremities is clinically difficult to repigmentation and resistant to treatment due to its lack of hair follicles. Platelet-rich plasma (PRP) is a concentrated platelet plasma obtained by in vitro isolation of autologous whole blood, and its effect on repigmentation of vitiligo at the extremities and the potential mechanism remain unclear. The investigators investigated the efficacy of PRP on acral vitiligo by a single-center, prospective, self-controlled clinical study.