Botox used occasionally for acne scarring
Although I have not used BOTOX for acne scarring, some have found it somewhat successful for this problem. It seems to work by relaxing the local muscle tone and thereby letting the scar soften. Its use for this, even by proponents, is limited, especially compared to fillers. I personally like Cosmoderm for this use, but the hyaluronic acid fillers are also quite good. Injection technique has to be quite precise, or you might end up with blue blebs.
Hope this answers your questions....