A child has multiple itchy papular lesions on genitalia and fingers. Similar lesions are also noted in his younger brother. What is the diagnosis?

The four cardinal features suggestive of scabies 1 Presence of burrow in S. Corneum especially on the hand or penis 2 Characteristic distribution of lesions: Face, palm, soles involved in infants but spared in adults. Circle of Hebra: Web spaces, groins, periumblical area and flexors of wrist, elbow & axilla. 3 History of similar illness in other family members 4 Intense pruritus (nocturnal)