Seborrheic keratosis

Seborrheic keratosis is a noncancerous skin growth that often appears in older adults. It is characterized by its waxy, slightly elevated appearance and can vary in color from light tan to black. Seborrheic keratosis is typically not a cause for concern unless it becomes irritated or aesthetically displeasing.

Seborrheic keratosis on human back

Micrograph of a seborrheic keratosis (H&E stain, scanning magnification)

Causes

The exact cause of seborrheic keratosis is unknown. However, they tend to be more common in older adults and may be genetically inherited. Some studies suggest that sun exposure may also play a role in their development.

Symptoms

Seborrheic keratosis typically presents as a round or oval-shaped growth on the skin. They can appear anywhere on the body, but are most commonly found on the face, chest, shoulders, or back. The growths are usually brown, but can range in color from light tan to black. They have a waxy, scaly, slightly elevated appearance and are often mistaken for warts or melanoma.

Diagnosis

Seborrheic keratosis is usually diagnosed through a physical examination. In some cases, a biopsy may be performed to rule out other conditions, such as skin cancer.

Treatment

Treatment for seborrheic keratosis is typically not necessary unless the growth becomes irritated or the individual is unhappy with its appearance. In these cases, the growth can be removed through cryosurgery, electrocautery, or curettage.

See also

• Actinic keratosis
• Skin cancer
• Melanoma

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