I really do not know but is it staying there and will he let you touch him so you can see if it is something that will go away if touched or something like a blister? I have never heard of anything like it unless he has an actual bubble that he got from playing and it just stuck to him. Does he bubble dive in the airstone bubbles? Oh, and how does he like the pingpong ball? He does not sound sick but keep an eye on him and make sure that it goes away and more do not show up or it does not get bigger.
Let us know please, I am totally curious.
Rose
