It is very difficult to treat a fish without having a good idea of what you are dealing with. In some situations raising the temp is a bad idea and will speed up the growth of parasitic organisms. With ick this is desirable combined with a salt treatment but in the case of some bacteria you can worsen the condition. Other issues are viral and just have to run their course. I am far from an expert on fish illnesses, but if you can get some clearer images of the problem someone may be able to accurately diagnose the problem or at least narrow it down.
X2 on post up water parameters. If you have not tested recently I would definitely start there.
