About ten days ago I noticed that I had a red rash on the back of my head. I went to the doctor and he feels that it is some kind of contact dermatitis. I had been using bleach and a mask (with straps) to clean. He said it's possible the straps are what caused this (possibly the straps had lingering bleach on them) I had used the bleach and mask for about 5-7 days before I got a haircut and noticed it (picture attached). He prescribed betamethasone valerate foam. It's been 10 days since I started using it and it seems to be getting a bit lighter but it hasn't really improved that much. It definitely has not gotten worse. The reason I went to him in the first place is that I adopted a cat that I found out has ringworm and I've been treating the cat. I only had the cat for about a week before I noticed the rash on the back of my head (is that too fast for ringworm on the scalp?). My doctor doesn't seem to think this is fungal at all (there's no missing hair - I cut my hair very short). I'm worried because he didn't do a culture or anything. But the rash seems to line up with the way the mask was strapped to my head. Thoughts?