 [ Symptoms ] itchy rash for 2+ months it is on back stomach arms armpits legs…scabies [ Disease ] hi scabies wont present in this way for sure and it is not skin infection either only thing that comes to my mind is some kind of allergy allergy may be to anything in his surrounding or food if you have tried changing soap clothes etc try and do some changes in his food the allergen needs to be found out consult a dermatologist thanks