Sorry, the pictures aren’t clear enough to see. Does the fish have any other symptoms? What other fish are in with it, any of them a possible culprit for doing damage? How long have you had the fish? New basslets sometimes get a minor viral infection called lymphocystis.
Jay
He seems fine swimming and eating well it doesn't seem to worries him I only got him a few days ago and he had a fair travel to get here so I though maybe got bumped around