Looks like digenetic flukes ( a type of flatworm). They can grow up to almost a half an inch in length. They can lodge themselves on and under the skin, fins, inside the gut, blood system or bladder. As posted above treating internally with General Cure + Food + Focus will get the meds internally to the fish. But your fish is displaying the flukes "externally" suggest you consider dosing a QT into the water with General Cure. Dose and then 5-7 days apart dose again with a 25% water change before the second dose. Good luck with your pink spot. Mines looking at me right now. I think he's hungry. LOL