Eileen fisher women’s black casual or dressy 100% silk pants with discoloration

See photos. I’m not sure what the discoloration is a result of or how easy it would be to fix. Also one small blemish I could find, also pictured in photos. Otherwise in excellent used condition structurally. From a smoke free, pet friendly home. Has pockets. Numbers on tag: RN 78121 CA 34460 Approx measurements taken by hand laying flat: Waist 16” Length 39” Leg opening at bottom 6”