I was also diagnosed with Derma. I think I've narrowed this big flareup to a chemical reaction (I have MCS). Used tons of aloe vera gel with lidocaine just before my reaction. I used it on bites on scalp. Everyone knows there are tons of blood vessels there and it gets into the bloodstream quickly.
I've had an sonogram (ovarian) and yesterday an EMG at the neurologist's office. So far I'm NORMAL.
Be careful with the new chemicals they're adding to lotions these days. Lidocaine is a new one and it can be toxic to those with mcs. Also they're adding preservatives to them and they can be toxic too.
Just a warning!