In general, a patient can begin using sunscreen after eyelid surgery once the incision has closed with enough strength to allow some rubbing and massage. This is usually 2-3 weeks for most patients. Dr. Azouz determines when a patient can begin applying sunscreen or silicone gel in the post-surgical period for the individual patient. Sunscreen and silicone gel are some of the only proven skincare regimens proven to make scars the best they can be. Sunscreen is critical in preventing hypertrophic and hyperpigmented scars. That being said, eyelid surgery has some of the best hidden and best healing scars in plastic surgery.