I doubt very much that you have a fungus--your description sounds nothing like one. Lamisil is innocuous, so you can continue taking it, but I doubt it will do anything. I am not at all sure what your dermatologist was treating with an injection in the hip. I suggest you contact the doctor covering for the dermatologist--if you can't access one, find another dermatologist. This sounds like an irritation of some sort, not an infection, particularly not a fungal one. For this reason, I doubt that you are contagious, though of course I can't say for sure, sight unseen. (Cortisone is not used for infection, so clearly the dermatologist didn't think you were infected either.)
Take care.
Dr. Rockoff