Dark strech marks or scars. Help me out?

Actually about a year ago i have a fungal infection in my inner thighs and the first whom i tell the problem he give some medicine and some gel that was pathetic it doesn't cure and because of that gel my skin gets so much sensitive and lot of dark scars were all over my inner thighs and all around my vagina too after that i visit to a dermatologist and he give me some medicine and the fungal infection was cure and for those marks he suggests for the strech rid cream and after that i used so many strech cream and bio oils but nothing is working on those scars please which cream or oil should i used to lighten then because they are nit just marks my skin is damaged i can feel it it's like someone scratch with nails so which cream should or what should i do please help me out ??