Seborrhoeic keratosis is a common benign skin growth that appears as a waxy, scaly patch that looks “stuck onto” the skin. Though harmless, it can resemble skin cancer. It typically develops after age 40 and may appear anywhere except the palms and soles, varying in colour from light beige to dark brown or black.
Seborrhoeic keratosis (sometimes called a seborrhoeic wart or basal cell papilloma) is a benign overgrowth of the outer layer of the skin (the epidermis). It is not caused by infection or linked to skin cancer, although these growths can sometimes resemble malignant lesions.
They can appear anywhere on the face, trunk, back, arms, or legs, but are most common on areas exposed to sunlight such as the chest and upper back. The texture can vary from smooth and waxy to dry, crusted, or wart-like.
eborrhoeic keratoses vary in appearance, but they share several characteristic features:
The exact cause remains unclear, but several factors appear to contribute to their formation:
Seborrhoeic keratoses are not contagious and cannot be passed from person to person.
Diagnosis is usually made through a visual and physical examination by a GP or dermatologist. The distinctive “stuck-on” appearance often provides enough information for identification.
If there is uncertainty, especially when a lesion appears dark, irregular, bleeding, or changing, further tests may be performed to rule out melanoma or other types of skin cancer.
Seborrhoeic keratoses are benign and usually do not require treatment unless they cause discomfort, irritation, or cosmetic concern. Some people choose removal for aesthetic reasons or when lesions frequently become inflamed.
These treatments are safe and effective when carried out by qualified clinicians. Temporary redness or pigmentation changes may occur after removal.
Seborrhoeic keratoses are completely benign and do not transform into skin cancer. Many people develop multiple lesions over time, and new ones may continue to appear with age. Once removed, the same lesion will not recur, but others can develop elsewhere.
Although harmless, seborrhoeic keratoses can sometimes cause cosmetic distress or discomfort. Regular skin monitoring remains important, as other conditions such as melanoma can look similar.
There is no guaranteed way to prevent seborrhoeic keratosis since it mainly results from ageing and genetic factors. However, the following measures may help reduce risk or slow development:
Regular skin monitoring and early medical consultation are key to maintaining healthy, evenly pigmented skin.
