Suggest Remedy For Black Marks On Face

hi,i have lot of black shade on my face & because of that my face looks very ugly.....i m taking antibiotic azithromycin 250mg twice a daily & 3 days in week & also taking multivitamin tablet but its around one month & i m not getting any difference on my face!!!!!!!!!!!!what i do ? can use any gel cream???????????what to do tell me please i m in depression because of that/...........so please help me......reply soon...