Patients are however advised to get more sleep and drink less caffeine. Eyelid dermatitis is the inflammation of the eyelid skin. It is mostly a result of allergies or contact dermatitis of the eyelid. Symptoms include dry and flaky skin on the eyelids and swollen eyelids. The affected eyelid may itch. Treatment consists in proper eye hygiene and avoiding the allergens that trigger the condition. In rare cases, topical creams may be used but only under a doctor's supervision. Ptosis (drooping eyelid) is when the upper eyelid droops or sags due to weakness or paralysis of the levator muscle (responsible for raising the eyelid), or due to damage to nerves controlling the muscle. It can be a manifestation of the normal aging process, a congenital condition, or due to an injury or disease. Risk factors related to ptosis include diabetes, stroke, Horner syndrome, Bell's Palsy (compression/damage to Facial nerve), myasthenia gravis, brain tumor or other cancers that can affect nerve or muscle function. Ablepharia (ablepharon) is the congenital absence of or reduction in the size of the eyelids. Surgery The eyelid surgeries are called blepharoplasties and are performed either for medical reasons or to alter one's facial appearance. Most of the cosmetic eyelid surgeries are aimed to enhance the look of the face and to boost self-confidence by restoring a youthful eyelid appearance. They are intended to remove fat and excess skin that may be found on the eyelids after a certain age. Eyelid surgeries are also performed to improve peripheral vision or to treat chalazion, eyelid tumors, ptosis, extropion, trichiasis, and other eyelid-related conditions. Eyelid surgeries are overall safe procedures but they carry certain risks since the area on which the operation is performed is so close to the eye. Anatomical variation An anatomical variation in humans occurs in the creases and folds of the upper eyelid. An epicanthic fold, the skin fold of the upper eyelid covering the inner corner (medial canthus) of the eye, may be present based on various factors, including ancestry, age, and certain medical conditions. In some populations the trait is almost universal, specifically in East Asians and Southeast Asians, where a majority, up to 90% in some estimations, of adults have this feature. The upper eyelid crease is a common variation between people of Caucasian and East Asian ethnicities. Westerners commonly perceive the East Asian upper eyelid as a "single eyelid". However, East