I noticed a bump under my penis head yesterday morning. It looks like a water blister and It does not itch ot hurt. I tried to pop it this morning but I am a little afraid. There is not any other sympthoms. I have not had a sexul intercourse in 2 months and it was protected (besides the oral sex). I think I just irritated the skin while masturbating or something. I have never had this problem before. Any serious inputs are greatly appreciated. 

That's the way it looks like: 

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 (don't look at the pearly penile papules they are harmless. Look just at the single bump nex to the skin connecting to the penis head)