Skin hurts - no visible rash
Over the last few days I've experienced skin pain in a few areas on my chest and back. More specifically, the area around my nipples, a small area under my left arm and a small area on the left side of my back are sensitive to touch. The pain is brief and feels somewhat similar to the pain associated with a sunburn - but I have not had my chest or back exposed to the sun in the last several weeks. The slightest movement of clothing also seems to cause the pain to occur.
It may be a coincidence, but I've recently developed a couple of canker sores in my mouth over the last few days as well.
I'm a 48yr old male and a little overweight. My health has been good otherwise. I've not had any changes in laundry detergents or eaten anything out of the ordinary.
Does anyone have a clue what this might be?