The lesions by the anal fin don't look like a typical coral sting to me, and it isn't in the common location (face). Additionally, the clown seems to be holding its fins clamped a bit. How long have you had the fish, is it still eating? If this did begin with the coral stings, the areas seem infected to me, but you would be in a better position to judge, as that can be difficult to see from photos. If you had the ability to move the fish to a treatment tank it would get them away from the corals and give you the ability to treat with a broad spectrum, gram negative antibiotic.
Jay