A scaly skin eruption.
This is the law for all manner of plague of leprosy, and SCALL, and for the leprosy of a garment, and of a house, and for a rising, and for a scab, and for a bright spot: to teach when it is unclean, and when it is clean: this is the law of leprosy. ( Leviticus 14:54-57 )
Bibliography Information"Entry for 'Scall'". A King James Dictionary.