<prompt> Pathergy test is used for ?Reithers syndromeBechets syndromeLichen planusAtopic dermatitis  <response>: Ans. is b i.e., Bechets syndrome Criteria for diagnosis of Bechets disease Recurrent oral ulcer for at least 3 times in 12 months. Plus any two of the followings :? Recurrent genital ulcer. Eye inflammation with loss of vision. Characterstic skin lesion erythema nodosum. Positive pathergy test skin prick test. 