HELP- clown has sore on it!!!

[a&m aggie 04']

My roommates maroon clown has what looks like a sore on its yellow stripe.
The sore is red on the outside, and white in the middle. The middle white part looks like it is pretruding a little bit. Anyone know what this is and how to treat it???
Thanks, Mark

 

[beth]

I'm assuming you're Hunter's friend?

 

[a&m aggie 04']

yeah,
he just went to the store to get his water tested, so we'll see whats up pretty soon.