my mother, 80, has numbness in her toes. mostly at night. She can move her toes, but they tingle and are numb. 2 toes are swollen, and she has a black spot on the side of her big toe. Any idea what may cause this, and advice on if she should get it seen right away? She has a doctor appointment in 3 days, but not sure if she should wait.
Background: She is being treated for high blood pressure, and has trouble walking due to osteoarthritis in her knees.