The Combination Therapy of Fractional Laser and PRP Compared With Nanofat Grafting and PRP Synergy in Treating Striae Gravidarum.

The investigators will pick out two areas of most severe striae gravidarum on a participant's abdomen. One of the areas will be treated by fractional laser once every three months for 2 times combined with PRP injection once a month for 6 times. Another area will be treated by nanofat grafting once every three months for 2 times and PRP therapy once a month for 6 times. The participants were asked to come back 1、3、6、9 months after treatment for further follow-up. Before and after the treatment, the striae gravidarum will be assessed subjectively by satisfaction assessment, dermatoscope and ultrasound, and objectively by immunohistochemical analysis.