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and roughness of the penile skin will take few more months to become normal if it is superficial. Just applications of emollients like liquid paraffin
Regarding your erectile difficulty, the superficial skin burns has nothing to do with erectile function. If you have a deeper scar and painful intercourse then you may have to consult a plastic surgeon for further help. Otherwise after a short time you will regain your normal sexual function.
If you have erection during early morning you are almost normal.
Get well soon.