Hello, Thank you for posting. The conditon you described is very difficult to diagnose untill proper physical examination. For now it can be two things. Firstly he might have got an acute attack of hives or urticaria which is a common allergy causing rash and itching all over body. It ususally subsides on its own but may require a short course of corticosteroids and antihistamincs which your GP or dermatologist can easily prescribe for you. Secondly he might have contracted scabies which is common in people who frequently go for camping. For scabies, you might want to launder all his clothes, bedding inwarm water to remove tiny mites which cause scabies. Apart from this, he needs oral (ivermectin)and topical antiscabetic cream(permethrin 5%) to get rid of mites from his body.