You cannot safely get rid of dark elbows overnight
Gently exfoliate the area once
Apply a thick moisturizer
Use petroleum jelly over moisturizer before bed
Wear long sleeves or cover the elbows overnight
Avoid scrubbing, lemon, baking soda, or harsh bleaching products
Use sunscreen on exposed elbows during the day
Repeat daily for gradual improvement
See a dermatologist if the darkening is sudden, severe, itchy, or persistent