The cause of seborrheic keratosis is unknown, but genetic mutations have been identified in certain types. The lesions commonly occur in middle age and later and most often appear on the trunk or temples. In darker-skinned people, multiple 1- to 3-mm lesions can occur on the cheekbones; this condition is termed dermatosis papulosa nigra.
Seborrheic keratoses vary in size and grow slowly. They may be round or oval and flesh-colored, brown, or black. They usually appear stuck on and may have a verrucous, velvety, waxy, scaling, or crusted surface.
Seborrheic keratoses that are large, multiple, and/or rapidly developing can be a cutaneous paraneoplastic syndrome (Leser-Trélat sign) in patients who have certain cancers (eg, lymphoma, gastrointestinal cancer).
Seborrheic keratoses are benign pigmented lesions. Cause is unknown. They tend to develop in older people and have a stuck-on appearance with a verrucous, velvety, waxy, scaly, or crusted surface.
This photo shows seborrheic keratoses (hyperpigmented lesions with a stuck-on appearance) on a patient's back.
This photo shows multiple, small seborrheic keratoses on the cheekbones and forehead of a person with dark skin.
This photo shows the Leser-Trélat sign, which is represented by multiple light tan to dark brown, flat, and slightly elevated, oval and round benign skin lesions (seborrheic keratoses) on the back of a patient.
Diagnosis
Treatment
Drugs Mentioned In This Article
| Drug Name | Select Trade |
|---|---|
lidocaine |
XYLOCAINE |
