Take a flash light to it and shine the body. If you see more treat it fast. I just lost 2 of my beautiful angels just like yours, tried to treat without strong meds and it just got worse for me. Tried heat and salt, didn't work. Now the 4 out of 6 that are left are in a hospital tote being treated with ich-X. Just a heads up. If you gotta treat your fish, be careful when getting some meds.(if you use meds) Some will stain the silicone on your tank blue. If the spots are big and the look like a bubble on the fin should act fast, cause it will most likely be ich. If you have other fish in that tank I'd get your angel out a.s.a.p. so others don't get it.