Betta Bump

Hello! I came home from a weekend in Chicago to find one of my female bettas in the sorority tank has an odd lump on the side of her head. I tried googling the symptom but most results were for discolored lumps between the eyes. I'll post pictures when I can but she doesn't want to cooperate right now. It's basically behind her eye and above her gill. She isn't pineconing or bloated, swims and acts just fine, and the lump isn't discolored. I'm not quite sure what it is or what to do. All water parameters are normal and all other fish are just fine. If anyone has some advice, I'd greatly appreciate it. Thanks!

Could be lots of things. Most likely is a parasite, or some sort of infection in my estimation.

Sorry cant be of more help.

DavidZ

Update: She hasn't changed at all in behavior or appearance. The bump is there and all other fish are unaffected. I'd isolate her but my hospital tank is currently occupied by a new resident. I'm hoping it's a benign tumor or cyst. Fingers crossed! Thanks for the input David!