Hi Doctor I Have A Problem With My Skin It

Hi doctor i have a problem with my skin it started when i was 9yrs,i was having a chicken pox and i visited a clinic nd they gave me calamine after that my skin was never be the same again it turns to be pimples nd the skin becomes oily nd having blackheads i've been using lot of creams nd they are not helping me nw i'm taking pills doxy pills,ascorbic pills nd purbic pills bt still they are not helping i want knw what can i use?