The oil lasting on the clothes is a myth. If you know you've been in contact w it wash with warm soap and water. Launder the clothes they'll be alright. The usual calamine /hydrocortizone works for the itch. A really severe spot can be treated with a dab of laundry bleach and it will scab over in a day. Don't scratch it. and it isn't contagious from one person to another.