A common, benign skin growth that appears as a brown, black, or tan wart-like lesion on the skin

What is Keratosis Seborrheic?

Keratosis Seborrheic, more commonly referred to as Seborrheic Keratosis, is a non-cancerous (benign) skin growth that typically appears in older adults. These lesions often have a waxy, “stuck-on” appearance and can vary in color from light tan to dark brown or black.

They are made up of excess skin cells and typically occur on the face, chest, back, or shoulders. While harmless, they may cause cosmetic concerns or irritation if rubbed by clothing or jewelry.

What causes Keratosis Seborrheic?

The exact cause is unknown, but the following factors are believed to contribute:

• Aging – more common after age 50
• Genetics – often runs in families
• Sun exposure – may play a role in lesion development
• Possibly friction or skin rubbing

It is not contagious and not caused by a virus or infection.

Who is at risk?

• Adults over age 40, especially those over 60
• Individuals with a family history of seborrheic keratoses
• People with sun-damaged skin
• Slightly more common in fair-skinned individuals, though it can affect any skin tone

What are the symptoms of Keratosis Seborrheic?

• Waxy, raised lesions that appear “pasted on”
• Rough or wart-like surface
• Color variations: tan, brown, gray, or black
• Round or oval shape, usually small but can grow over time
• Can occur anywhere except palms and soles
• May become itchy or irritated, especially if scratched or rubbed
• Typically painless and slow-growing

How is Keratosis Seborrheic diagnosed?

Diagnosis is usually made through clinical examination by a healthcare provider or dermatologist.

In some cases, a biopsy may be performed if:

• The lesion has irregular borders
• It bleeds, changes rapidly, or looks suspicious
• There is concern about possible skin cancer (especially melanoma)

How is Keratosis Seborrheic treated?

No treatment is necessary if the lesion is not bothersome.

However, treatment may be desired for cosmetic reasons or if the lesion becomes irritated, itchy, or bleeds.

Removal options include:

• Cryotherapy (freezing with liquid nitrogen)
• Curettage (scraping the lesion off)
• Electrosurgery (burning the lesion)
• Laser therapy
• Shave excision

These procedures are usually done in a dermatologist’s office and are quick with minimal recovery time.

What is the prognosis for Keratosis Seborrheic?

• The condition is benign and not life-threatening
• No risk of spreading to other organs or turning into cancer
• New lesions may appear over time, especially with age
• Removed lesions typically don’t recur, but others may develop elsewhere

Can Keratosis Seborrheic be prevented?

There is no guaranteed way to prevent seborrheic keratosis, especially when it is hereditary, but some general tips include:

• Protect skin from sun damage with sunscreen and protective clothing
• Avoid harsh skin treatments or friction in prone areas
• Regular skin checks to monitor changes and ensure early diagnosis of any suspicious lesions