At your age pimples could have occurred due to hormonal
problem/ facials/ cosmetic use/ particular medicine intake. Firstly the cause should be ruled out. As you have mentioned that the prescribed creams are suiting you well, kindly continue with it. As far as scars
and marks are concerned, you can take chemical peels
, micro needling sessions or can apply pigmentation reducing creams too. For the same your scars and marks need to be analysed and then only a proper treatment can be advised. Take care.