Hi

Id go and get it checked out *not to worry you* but my son had like a blister at the side once and only once and when I ask my nurse about it she did say to keep an eye on it as there was abit few boys that had a leek at the end of the penis in side and it was making the end fill up. She said it isnt painful but needs to be fixed. Im sure it isnt anything but I would just get it checked.

Good luck