I get hives sometimes on my toes and skin after I injest oranges or juice. Could be an allergy. I think the penicillin creates a reactive mold in my body, and the feet are a breeding ground for traces of fungus, causing an internal biological battle.
Do you ever try a detox or fasting?
Have you tested water for contamination and heavy metals?
I get dry skin from our hard water. Many of my skin problems are alleviated by rubbing castor oil into the pores. It seals in moisture and draws out toxins.
Sorry I cannot tell you what is causing your health problem. Hope you discover a good solution.