Please help! Scale rot

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So, I saw this burmese python in our farm and I rescued and fed him cause he was thin back then. I noticed some reddish scales on his belly but didnt tought about it that much because he was very thin. Then after a couple of weeks these red spots began to spread all over his body. His gaining weight right now but im worried about his skin... I looked up some do it yourself medications online and started to bathe him with potassium permanganate everyday.. When he shed 4 days ago his skin got so much better but after a while these dark scales keep comming up ... Is this brown spots because of the potassium permanganate or it it that the medication doesnt work? ... Any other suggestions? ...