Hello and hope you are doing well.
The symptoms described by you could be due a skin disorder called eczema. People who suffer from this disorder should avoid contact with triggering factors like soaps, cosmetics, jewelry, clothing, and detergents. Sometimes sweat; changes in temperature and psychological stress are known to trigger these episodes. So, the best way to prevent attacks is to identify those substances which he is allergic to and avoid them. You can control the symptoms with prescription strength mild cortisone creams. Consult a dermatologist. Also, an allergy specialist can help to identify the allergens.
Hope this helped and do keep us posted.
My guess is dermatitis, lyme disease, allergies, or a type of skin condition.