What should I do with this ? (photos)

Hi .. i had a small dark spot between my breast and the dr told me sto use cosmelan 2 and i did then it becomes red and then it becomes big dark spot between my breast i think this area is very sensitive and i cant just use anything and i did tried to use some creams like southbeach i feel like its getting even worse and i hate my self for that i just ordered melarase am and pm do u think this will help with it or what should i do cause im very tired and i tried everything PLZ help