Well, the frog was never like this for the first 3 years I got it. I took care of it, but then one week I just forgot.
I clean the water with a filter. Maybe it is because a cricket was rotting in there that caused it...? I'm gonna clean the tank soon....

I emailed Dr. F and he replied with a couple of medicines I could use.
I used some Neosporin which he said was a sort of alternative to the meds he recommended.
I applied the Neosporin on the infected area (not on the eyes (should I apply it on the mouth??)
He seemed more active and started swimming around after I applied it! I don't know if it actually works that fast or if it even worked so...

Thanks for the support and lecture stuff! I'll try to keep you guys updated