I had a mole removal and i still feel there's something remaining on my head

I had a mole nevus removed from my head and I didn't touch it before but after 3 days or something I touched it and it feels like there's still something and my mom told me it's black... it was white before. is it still in the proccess of the healing? because after a wound something black or something like this covers your wound and it's in a proccess heal but the problem that it's a little bit big this thing, will it fall off later or something? and how much does it take?

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