One suggested it was rosacea, one said it might be dermatitis and the dermatologist said it could be those or lupus. Over many months I have had a raised red rash
the left side of my mouth but also some on the right side of the mouth. I also develop, at different times, redness all over my face (particularly across the nose and cheeks) like sunburn. This comes on then passes after a half hour or so. There is also an area of redness at the top of my arm , within a circular area.