Can see the ulcers on the head, but can't make out anything on the body.
It looks like HITH/Lateral line erosion condition.
It usually comes about from stress, combined with the presence of Spironucleus (a flagellate).
To tackle this, you need to identify the environmental causes and have it remedied. Dosing the tank with metronidazole would help. Once the environmental factors are corrected and medication applied, the holes will close up quickly. The scars could remain though, but the fish would be safe from the disease.