Besides skin and garments, Leviticus 14 gives rules for a defiling mildew found in what?

Answer: A house

Leviticus 14 covers mildew in a house in Canaan. If it spread again after repairs, the house had to be torn down and removed.

““When you enter the land of Canaan, which I am giving you as your possession, and I put a contamination of mildew into a house in that land,”— Leviticus 14:34 (BSB)