fig8

Figure 8. Immunohistochemical staining of type I collagen in neotissues (×400) at the 4th to 20th weeks after poly-D,L-lactic acid filler injections. A: at the 4th week; B: at the 8th week; C: at the 12th week; D: at the 20th week. Yellow arrows: type I collagen, with increasing number from A to D