Brown spot on nipples

I was wondering if anyone has had these before or knows what it could be? I noticed the other day when showering that both of my nipples and brown discolorations on them (not the areola, just the actual nipple) and when i touched them the skin on the end felt hard or rough.  So I tried lightly scratching at them and small chunks of skin or something was coming out of the nipple (it looked like not on top of the skin but actually out of the nipple) I know this is TMI but i was concerned   Any help would be appreciated, Thanks!

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