Xanthelasma

Overview

Xanthoma is a type of skin lesion caused by the excessive presence of fat within macrophage immune cells. Certain types of xanthoma serve as direct indicators of disorders associated with lipid metabolism, such as elevated blood fat levels and hyperlipidaemia. Types of xanthomas are classified according to their location on the body and the manner in which they develop.

Xanthelasma palpebrum is the most common type of xanthoma. The lesions form symmetrically on the upper and lower eyelids and are described as soft, yellow, and flat papules or plaques in appearance. Lesions initially appear as small bumps but eventually increase in size over the course of several months.

Causes and Risk Factors

Xanthoma is caused predominantly by disturbances in lipid (fat) metabolism. Such lipid disturbances may arise from genetic conditions such as familial hyperlipoproteinaemia, or from acquired metabolic disorders including diabetes mellitus and nephrotic syndrome.

Signs and Symptoms

Xanthelasma presents as soft, flat, yellowish papules or plaques that appear symmetrically on the upper and lower eyelids. Lesions typically begin as small bumps and gradually enlarge over a period of months. The plaques are generally painless but may be a cosmetic concern and may signal an underlying lipid disorder.

Diagnosis

A skin biopsy is sometimes performed to confirm the diagnosis of xanthoma. The assessment also involves identifying any underlying lipid disorder through blood tests, which are used to evaluate lipid composition and to monitor liver and muscle enzyme function for abnormalities.

Treatment Options

The treatment of xanthoma is closely linked with identifying and managing the underlying lipid disorder. A combination of dietary and lifestyle modifications, with or without medication, is used to address lipid disorders. Recommended dietary modifications include reduction of saturated fats such as coconut oil, palm oil, butter, and certain meats, as well as a reduction of simple and refined sugars found in cakes, candies, and carbonated drinks. A diet rich in vegetables, cereals, and fish is generally advised.

Prescribed medications may be used to reduce levels of LDL cholesterol and triglycerides, as well as to decrease cholesterol production by the liver. Treatment is monitored through frequent blood tests to assess lipid composition and to confirm that liver and muscle enzymes are functioning within normal parameters. Commonly used medications include statins such as simvastatin and atorvastatin, which belong to the class of HMG CoA reductase inhibitors, as well as fibrates such as bezafibrate, nicotinic acid, and ezetimibe.

Locally destructive modalities and surgical procedures may also be employed when the condition does not resolve with systemic treatment or when assigned treatments do not demonstrate adequate improvement. For xanthelasma specifically, treatment options include surgical excision, laser treatment, electrodesiccation, and topical trichloroacetic acid therapy.

When to Seek Medical Attention

Medical evaluation is recommended when yellow plaques or growths are noticed on or around the eyelids, particularly if there is a known or suspected history of elevated cholesterol or other lipid disorders. Early assessment by a dermatologist allows for timely diagnosis of any underlying metabolic condition and appropriate management of both the skin lesions and associated systemic concerns.