I have pimple from last five years ago after my friend works in a medical shop and they suggest me some tablet after use that my pimples are gone and my skin is good after 5 months I use scrub of the men company and after that some small pimple are come back on my face after that I have using tretiva 20 from last five days the is that my skin is dry and lips also and pimples are change into white color small size and newly pimple are create on different ways on face so there is any problem to use tretiva 20 please suggest.