What is a basal cell carcinoma?
A basal cell carcinoma (BCC) is a type of skin cancer. There are two main types of skin cancer: melanoma and non-melanoma skin cancer. BCC is a non-melanoma skin cancer, and is the most common type of all skin cancer in the UK. BCC are sometimes referred to as ‘rodent ulcers’. They are locally invasive and do not spread to other parts of the body.
What causes basal cell carcinoma?
The commonest cause is too much exposure to ultraviolet (UV) light from the sun or from sunbeds. BCC can occur anywhere on your body, but is most common on areas that are often exposed to the sun, i.e. your face, head, neck and ears. It is also possible for a BCC to develop where burns, scars or ulcers have damaged the skin. BCC is not infectious. BCC mainly affects fair skinned adults, but other skin types are also at risk. Those with the highest risk of developing a basal cell carcinoma are:
- people with pale skin who burn easily and rarely tan (generally with light coloured or red hair, although some may have dark hair but still have fair skin)
- those who have had a lot of exposure to the sun, such as people with outdoor hobbies or outdoor workers, and people who have lived in sunny climates
- people who use sun beds or sunbathe
- people who have previously had a basal cell carcinoma
Are basal cell carcinomas hereditary?
Apart from a rare familial condition called Gorlin’s syndrome, BCCs are not hereditary. However some of the things that increase the risk of getting one (e.g. a fair skin, a tendency to burn rather than tan, and freckling) do run in families.
What does a basal cell carcinoma look like?
BCC can vary greatly in their appearance, but people often first become aware of them as a scab that bleeds occasionally and does not heal completely. Some BCC are very superficial and look like a scaly red flat mark; others have a pearl-like rim surrounding a central crater. If left for years the latter type can eventually erode the skin causing an ulcer; hence the name “rodent ulcer”. Other BCC are quite lumpy, with one or more shiny nodules crossed by small but easily seen blood vessels. Most BCC are painless, although sometimes can be itchy or bleed if caught on clothes or picked at.
How will my basal cell carcinoma be diagnosed?
Sometimes the diagnosis is clear from its appearance. If further investigation is necessary to confirm the diagnosis then a small area of the abnormal skin (a biopsy) or the entire lesion (an excision biopsy) may be cut out and examined under the microscope. You will be given a local anaesthetic beforehand to numb the skin.
Can basal cell carcinomas be cured?
Yes, BCCs can be cured in almost every case, although treatment becomes complicated if they have been neglected for a very long time, or if they are in an awkward place, such as near the eye, nose or ear. BCCs never spread to other parts of the body except very rarely (fewer than 1 in 20) if neglected for years, when it may spread to draining lymph nodes. Hence, although it is a type of skin cancer it never endangers life.
How can a basal cell carcinoma be treated?
The commonest treatment for BCC is surgery. Usually, this means cutting away the BCC, along with some clear skin around it, using local anaesthetic to numb the skin. The skin can usually be closed with a few stitches, but sometimes a small skin graft is needed.
Other types of treatment include:
MOHs micrographic surgery – recognised as the gold standard for critically sited, ill defined BCCs. This involves the excision of the affected skin that is then examined under the microscope straight away to see if all the BCC has been removed. If any residual BCC is left at the edge of the excision further skin is excised from that area and examined under the microscope and this process is continued until all the BCC is removed. The site is then usually covered with a skin flap/graft. This is a time consuming process and only undertaken for certain BCC in difficult anatomical areas and cosmetically important sites. MOHs surgery is recognised for the highest cure rates and better cosmetic outcomes.
Radiotherapy - shining X-rays onto the area containing the BCC.
Very superficial BCC:
- curettage and cautery – the skin is numbed with local anaesthetic and the BCC is scraped away (curettage) and then the skin surface is sealed by heat (cautery)
- cryotherapy - freezing the BCC with liquid nitrogen
- creams - these can be applied to the skin, the two most commonly used are 5-fluorouracil (5-FU) and imiquimod
- photodynamic therapy - a special cream is applied to the BCC which is taken up by the cells that are then destroyed by exposure to a specific wavelength of light, this treatment is only available in certain dermatology departments
Surgical excision is the preferred treatment, but the choice of other treatments depends on the site and size of the BCC, the condition of the surrounding skin and number of BCC to be treated (some people have multiple) as well as the overall state of health of each person to be treated.
What can I do?
Treatment will be much easier if your BCC is detected early. BCC can vary in their appearance, but it is advisable to see your doctor if you have any marks or scabs on your skin which are:
- bleeding and never completely healing
- changing appearance in any way
Check your skin for changes once a month. A friend or family member can help you particularly with checking areas that you cannot easily inspect, such as your back.