It could be scabies, which is caused by a bloodsucking parasite that lives in the webbing of fingers, groin, navel, armpits and buttock cleft. The bites cause itching and rash. Apply an anti-scabies lotion from neck to toe for three consecutive nights after a warm bath. All clothes should be washed in hot water and ironed. Put all the bedding in the sun. Everyone in the family should be treated simultaneously even if they have no itching.