Female patient, postmenopausal has been having itchy patches on the skin of dorsum of both feet and ankles for six months. Itchiness on and off with pigmentation after few days. The patient is borderline hypothyroid with no medication. She is on hormonal therapy with anastrozole for CA breast.

Nondiabetic, nonhypertensive and no history of allergic conditions. The differential diagnosis for this skin condition? Please refer to pictures.