When my nipples gain thorny...?

my aerola kind of catch wrinkly or ridgy, I don't know how to describe it, its kind of similar to they're tightening. Also, they get tough when I'm eating brownies. Are both these things ordinary? Brownies have chocolate, and chocolate is an aphrodisiac, and aphrodisicas generate you randy, and when you're randy your nipple get rock-hard, I think.
That's my tie up of reasoning, at least.
I know what you're conversation about, though. It's raunchy, they look resembling raisins or something...
dont worry its ok. its common. maybe its puberty.