How To Get Rid Of Pimple Around Back?

hi .. i am naim from malaysia ... i am 24 years old malay gentlemen ..i was having pimple around by back for about 2 years and still not recovered yet ..recently i got something like acne and likely small cyst at my chin and neck.. i didnt take any medication because i was worried about medication`s side effect.. so now .. i was suggested to take tab isotrenoin 10mg daily..so i would like to ask about the side effect of isotrenoin..thanks ...