Rashi on Leviticus 13:48/רש"י על ויקרא י״ג:מ״ח

1לפשתים ולצמר‎ means OF FLAX OR OF WOOL.

2או בעור WHETHER IN A SKIN — this is a skin which has not been manufactured (of which no article has been made).

3או במלאכת עור OR IN ANYTHING MADE OF SKIN — this is a skin which has been manufactured.