Pea sized blister looking thing on my puppy's foreskin? What is it?

Pea sized blister looking thing on my puppy's foreskin? What is it?

He was just neutered about seven days ago and now has a pea sized lump/blister looking thing on the very end of the foreskin at the opening. I think it's painful for him. Any ideas?...
General Dog Discussions : Pea sized blister looking thing on my puppy's foreskin? What is it?...