My husband is having skin allergy which suddenly comes as reddish clusters all over his body. When it comes he will be having lots of itching and severe body pains. He has tried taking allopathy medicines. But it will subside till the medication is taken later immediately he will be getting more severe allergy. No doctor is able to identify what is the cause for it. All the blood tests are done and no issues in his reports. He's under homeopathy medication for more than an year and still sometimes he's suffering with the same problem. It will last for 2 days and then goes away. Please suggest some proper treatment? And someone tell me the cause?