Bowen's disease is a very early form of skin cancer that's easily treatable. The main sign is a red, scaly patch on the skin.
It affects the squamous cells, which are in the outermost layer of skin, and is sometimes referred to as squamous cell carcinoma in situ.
The patch is usually very slow growing, but there's a small chance it could turn into a more serious type of skin cancer if left untreated.
The most effective method of reducing your risk of Bowen's disease, as well as other more serious types of skin cancer, is to limit your exposure to the sun.
Bowen's disease itself is not usually serious. It tends to grow very slowly over months or years, and there are several very effective treatments for it.
The concern is that Bowen's disease can eventually develop into a different type of skin cancer called squamous cell skin cancer if it's left undiagnosed or neglected.
It's estimated this happens in up to 1 in 20 to 1 in 30 people with untreated Bowen's disease.
Squamous cell skin cancer is often treatable, but it can spread deeper into the body and is sometimes very serious.
Bowen's disease usually appears as a patch on the skin that has clear edges and does not heal.
Some people have more than 1 patch.
The patch may be:
The patch can appear anywhere on the skin, but is especially common on exposed areas like the lower legs, neck and head.
Sometimes they can affect the groin area and, in men, the penis.
If the patch bleeds, starts to turn into an open sore (ulcer) or develops a lump, it could be a sign it's turned into squamous cell skin cancer.
See a GP if you have a persistent red, scaly patch of skin and do not know the cause.
If necessary, your GP will refer you to a skin specialist (dermatologist) to determine what the problem is.
If your GP is not sure about the cause, they may need to remove a small sample of skin so it can be looked at more closely (a biopsy).
Bowen's disease usually affects older people in their 60s and 70s.
The exact cause is unclear, but it's been closely linked with:
Bowen's disease does not run in families and it's not infectious.
There are a number of treatment options for Bowen's disease. Talk to your dermatologist about which treatment is most suitable for you.
The main treatments are:
In a few cases, your dermatologist may just advise monitoring your skin closely – for example, if it's very slow growing and they feel the side effects of treatment will outweigh the benefits.
After treatment, you may need follow-up appointments with your dermatologist or GP to see if you need any further treatment.
If you had surgery, you may need to have any stitches removed at your GP surgery a few weeks later.