One of my sons had scabies when he was 4yo. He'd just gotten over chicken pox and we thought he had poison ivy. Turned out it was scabies, which wasn't too terrible to get rid of. Turns out that in adults scabies can manifest itself as itching on the hands, between the fingers (on that weblike part of skin), which I had. After treating myself for scabies my hand itchiness went away.
T&B