I Am 29 Years Old And Have Pimples ( Papules,

I am 29 years old and have pimples ( papules, pustules) on both side of my checks. This problem started just last year otherwise I use to have overall good skin. The pimples tend to appear and disappear all the time leaving behind scars. My skin is normal to slightly oily. I tried a month course of doxycycline, applied isotretinoic acid gel and presently on erytop gel. The skin around the pimple area have become dry but the pimples keep appearing. Please help