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Please stop doing these things with urine. There is good treatment available. Urine has lots of bacteria and will put your son in risk of severe infection and sepsis if applied to wounds. There is dysregulated immune system in your child which is why he has this problem. You can continue using Petroleum jelly. If there is severe itching
he can use 1% hydrocortisone cream
to be applied thinly on the lesions to relieve the itch. Also use coconut or Johnson's baby oil which will lubricate the lesions and prevent drying. He can use antihistamines as well for itching relief under medical supervision. He will need a course of steroids
which will be prescribed by a Dermatologist
once he is examined completely. Please do not get misled by people who will tell you to use urine to cure dermatitis
, there is rick pf severe infection. He can avoid wool, polyster mats, carpets, rugs as they trap dust and make allergy more. Let him not ear peanuts, eggs, shellfish or even milk if he has allergy to them.