Hair thinning can be due to hereditary or due to hormonal imbalance called PCOS. Get it checked by doing pelvic ultrasound during 2nd day to 5th day of periods. During winter season face becomes dry. Use Cetaphil gentle cleanser for face wash. Use episoft AC sunscreen lotion in the morning and afternoon. Drink enough of fluids. Eat healthy and more of protein in your diet. Dark spots on face could be due to nany reasons unless seen I won't be able to comment. But u can use golite cream full face in the morning and night. For further evaluation meet Dermatologist