Thanks for question,
You are perhaps suffering from Dermatitis Herpetiformis
, condition in which skin colored itchy lesions(mainly blisters)distributed on extensors esp on elbows, buttocks,nape,you must do biopsy
for exact diagnosis.if comes positive then tab dapsone
100 1 daily will be started for a long time meantime apply anti bacterial cum steroid
cream twice a day and take tab Lortadine 10 mg .
Dr Sher Bhutto