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Xanthelasma is a sharply demarcated yellowish deposit of cholesterol underneath the skin.

Xanthelasma is a sharply demarcated yellowish deposit of cholesterol underneath the skin. It usually occurs on or around the eyelids (xanthelasma palpebrarum, abbreviated XP).While they are neither harmful to the skin nor painful, these minor growths may be disfiguring and can be removed. There is no high-quality evidence that xanthelasma deposits are related to blood low-density lipoprotein levels or increased risk of atherosclerosis.

A xanthelasma may be referred to as a xanthoma when becoming larger and nodular, assuming tumorous proportions. Xanthelasma is often classified simply as a subtype of xanthoma.

Diagnosis
Xanthelasma in the form of XP can be diagnosed from clinical impression, although in some cases it may need to be distinguished (differential diagnosis) from other conditions, especially necrobiotic xanthogranuloma, syringoma, palpebral sarcoidosis, sebaceous hyperplasia, Erdheim–Chester disease, lipoid proteinosis (Urbach–Wiethe disease), and the syndrome of adult-onset asthma and periocular xanthogranuloma (AAPOX). Differential diagnosis can be accomplished by surgical excision followed by microscopic examination by a pathologist (biopsy to determine histopathology). The typical clinical impression of XP is soft, yellowish papules, plaques, or nodules, symmetrically distributed on the medial side of the upper eyelids; sometimes the lower eyelids are affected as well.

Treatment
Xanthelasmata can be removed with a trichloroacetic acid peel, surgery, lasers or cryotherapy. Removal may cause scarring and pigment changes, but it is an uncommon side-effect of treatment.

Prognosis
Recurrence is common: 40% of patients with XP had recurrence after primary surgical excision, 60% after secondary excision, and 80% when all four eyelids were involved. A possible cause might be insufficiently deep excisions.

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