I have acne and red spot on my face...i am going to use benzac (benzoyl peroxide) ac gel for treating it..so it is good choice or not? plz suggest

A good first try: Benzac ac (http://www.Benzac.Com.Au/why-it-works) is basically benzoyl peroxide with an added combo of absorbing beads and glycerin all act to dry up a lot of the oils that can clog up skin pores, causing an acne lesion. Without seeing you i cannot say if it will work but it may be a good start. See a dermatologist if this doesn't help.