hey ..this one is really easy...Its time to get some new laundry detergant. Especially childeren..have super sensitive skin. Laundry soap can remain in rinsed socks even after they are dry, also in the shoe itself.
Hello,
I cannot confirm anything without examination but it can be eczema or heat rash. Eczema is a form of chronic dermatitis (rash).Allergic reaction is one of the important causes of eczema. Allergic reaction can occur to strong soaps, Solvents, chemicals, certain foods, food additives, plants, metals, cosmetics, even urine and faeces of some animals (dust mites).
I feel that you should consult a pediatrician and discuss it with him.
Hope it helps. Take care and please do keep me posted on how your son is doing or if you have any additional queries. Warm regards.