Excess eyelid skin is the cause of dermatochalasis drooping, which can affect the upper or lower eyelids. Dermatochalasis typically develops as a result of aging, loss of elastic tissue in the skin, thinning of the connective tissue in the eyelids, gravity's impact, and collagen degradation. Blepharoplasty, or eyelid surgery, is used to treat dermatochalasis.