I recently purchased an all white male half moon betta fish from Petsmart in May 2013 and when i bought him I noticed a little raised bump (the same color as his body)...or what looked like a scar on the side of his body. I figured it might have been from earlier trauma or whatever, I still thought he was a beautiful fish, and decided to give him a home. (Sorry. You can barely see the scar here. I don't have many before pictures. It's toward the back half of his body.)
He lives in an unheated, filtered 3.5 gallon tank by himself with weekly partial water changes. I use a thermometer to keep an eye on the water temperature. I use "Tetra Aqua Safe" water conditioner. In June, I introduced two different mystery snails into his tank at separate times. He nipped at them so I removed them. One of these snails is still going strong in his own separate tank.
I feed my betta fish "Aqueon BettaFood" pellets once a day. Within the last couple days I noticed that the area where the scar was is becoming progressively gruesome looking. The area is larger, about twice the size and more raised. The color has remained the same, white. There looks to be a tiny pin-prick sized red hole in the middle of all this white gunk. His behavior hasn't changed throughout this process. Last night he was making a new bubble nest and he still fights his reflection like always.
He doesn't appear to be suffering, but I'm not a fish expert and I'd like to get him healthy as soon as possible. Thank you for your help.