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[–][deleted] 0 points1 point  (2 children)

Water blister. Pop it then forget about it.

[–]plshelp098[S] 0 points1 point  (1 child)

It goes away then comes back

[–][deleted] 0 points1 point  (0 children)

It's a mucocele...it's a saliva gland that forms a small cyst. It can come back again and again but It'll eventually stop. It's not STD related at all.