A pink bump on the outside could be an anal gland issue or it could be some type of razor irritation. The same goes for the biting. Both can cause that type of irritation. Unless he can't poop, there is no reason to go to the ER. Just have the vet look this week. Emptying, particularly with no good reason, can cause issues like further need to do the same, but I doubt the lump is from squeezing too hard.
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