13 years male has itching in fingers and hand and other parts of body . If he rubs swelling will occurs .please rx and dx

This rash 3yr old male. itchy progressive.diagnosis and treatment please

b'3 months old infant ,playful, active ,no fever. \nScabies ???'

One year 9 months boy having sever itching and patches over the knee folds and face, scapula region , body .. sir , madam please advise

b'M/78, C/o. Sudden itchy eruption twice or thrice in a month, resolves on its own. Comes and goes away. No other complaints. Spot Dx Rx.'