I have dark spots and I develop small shells that...

What are the causes of dry skin and dark spots?
Anemia
Exposure to sunlight
Staying up late for hours
Eat some substances such as cigarettes, alcohol and some drugs
Insomnia 
aging
What is the treatment of dry skin and dark spots?
Regulating sleeping hours and not staying up late
Not drinking coffee and stimulants too much
Make a face mask consisting of cutting cucumber and buttermilk to moisturize the skin
Use Correction cream for two weeks
Eat a balanced lunch of plenty of vegetables and fruits
Eat foods rich in vitamin C, such as orange and lemon juice
Drink a large amount of water
Avoid exposure to the sun at noon or afternoon
Stay away from dry weather
Use oils such as coconut oil or sesame and rub the skin with it
Not to use chemical preparations that are used to whiten the skin, as they contain ammonia and some harmful pigments that harm the skin in the long run.
Use moisturizing ointments like bepanthene
Use of a multivitamin