i'm no expert on diagnosis of fish illness at all to be honest, but the information i do know is that "red lumps" or "angry red" type tissue on the skin is usually (but not always) a sign of a bacterial infection.
With this in mind you could go down the route of either
- Waterlife Myxazin
- Interpet Anti Internal Bacteria (it works on external bacteria too)
- Melafix (weaker medication than the above two)
Good water changes could also help
Are the other fish in tank all ok?
Do you know your water stats at all?
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