What are seborrhoeic warts?
Seborrhoeic warts are also known as seborrhoeic keratoses. In the past they were also called senile warts. They usually look like greasy or crusty spots which seem to be stuck on to the skin. The colour varies but usually they are darkish brown or black.
They are usually round although they can also be oval in shape. Some seborrhoeic warts have an irregular shape. Their size can vary from around one centimetre to several centimetres in diameter.
Seborrhoeic warts tend first to appear around the age of 40. They can sometimes run in families. The actual cause of seborrhoeic warts is unknown. It can be common to develop several seborrhoeic warts as you become older. Also, as time goes by, each wart tends to grow slightly and become darker. They can occur anywhere on your body, other than on your palms or soles.
Pictures of seborrhoeic warts can be found here: www.dermis.net:80/dermisroot/en/21934/diagnose.htm
Are seborrhoeic warts serious?
No. Seborrhoeic warts are always benign. That means they do not spread, they are not cancerous or cannot develop into a cancer and do not cause any serious problems. The main problem is that they can sometimes look unsightly, particularly if they develop on your face.
Note: although they are called warts, they are not caused by the wart virus. They are not infectious.
Can seborrhoeic warts be treated?
If they do not cause any problems then it is best that they be left alone. Without treatment, they usually continue to grow and can become darker and more crusty. However, they do increase in size very slowly.
If required, however, they can be removed quite easily. Seborrheic keratoses are usually removed because they itch, they interfere with clothing or jewellery or they are unsightly.
Two commonly used methods to remove them are:
- By using a curette. This involves ‘freezing’ the surrounding skin with local anaesthetic. The seborrhoeic warts are then scraped off with a sharp surgical instrument called a curette.
- Liquid nitrogen treatment. Liquid nitrogen is very cold and anything it touches is killed by the cold. Small amounts of liquid nitrogen can be sprayed on to small seborrhoeic warts. They are killed and drop off a few days later. Normal skin replaces the area left behind. Liquid nitrogen is not suitable for larger warts.
Sometimes lasers can be used to remove seborrhoeic warts. Once a seborrhoeic wart has been removed, it will not return.
References and Disclaimer | Provide feedback
- Balin AK; Seborrhoeic Keratosis; eMedicine, January 2009.
- Brodsky J; Management of benign skin lesions commonly affecting the face: actinic keratosis, Curr Opin Otolaryngol Head Neck Surg. 2009 Aug;17(4):315-20. [abstract]