Skin cancer is the rapid growth of abnormal cells in the epidermis caused by unrepaired DNA damage. Physicians identify the type of skin cancer by looking for irregular shapes and colourings on the skin as well as examining the cells. There are three main types of skin cancer:
- Basal cell carcinoma (BCC)
- Squamous cell carcinoma (SCC)
- Melanoma
These tumours often develop on skin that is exposed to the sun’s harmful ultraviolet (UV) rays or UV tanning beds. Detected early in the precancerous stage, a dermatologist can remove it entirely with minimal scarring. If it is left unchecked, a cancerous growth can penetrate below the skin. When it gets to this stage, deeper surgical intervention may be required.
Basal Cell Carcinoma & Squamous Cell Carcinoma
Non-melanoma skin cancers such as basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) are less likely to be life-threatening. However, they can be locally destructive and disfiguring if left untreated. A skin cancer check will help to ensure there are no abnormal cells in your skin.
BCCs and SCCs occur when UV radiation or other damaging agents trigger abnormal changes in the basal cells and squamous cells respectively. Located in the epidermis, basal cells are responsible for forming new cells to replace the squamous cells that wear off the skin’s surface. As basal cells move up in the epidermis, they get flatter and eventually become squamous cells.
BCCs typically present as shiny bumps, open sores, reddish patches, pinkish growths or scar-like areas. Lesions can vary in size and may sometimes ooze, itch, or bleed.
SCCs can appear as scaly red patches with irregular borders, open sores, wart-like growths that may crust and bleed, or raised growths with a central depression. SCCs are more likely to grow into deeper layers of skin and spread to other parts of the body.
The majority of BCCs and SCCs can be fully eliminated if diagnosed early and treated when the cancer is small. Patients affected by BCCs or SCCs possess an increased risk of other skin cancers, especially melanoma. Regular self-skin examinations and an annual skin cancer check by a dermatologist are highly recommended.
Melanoma
Melanoma, the most dangerous form of skin cancer, develops in cells known as melanocytes. These skin cells are responsible for producing melanin pigment which gives the skin its colour. Detecting melanoma early is vital as it can spread to other parts of the body and become life-threatening if not treated at an early stage. For this reason, you should seek a regular skin cancer check to ensure your moles are benign.
Melanomas often resemble moles and sometimes may arise from them. They can be found on any area of the body, even in areas that are not typically exposed to the sun. Once a mole has developed, it will usually stay the same size, shape, and colour for many years. However, cancerous melanoma cells may change over time. Most people have moles, and almost all moles are harmless. It is important to recognise changes in a mole (such as in its size, shape, colour, or texture) that can suggest a melanoma may be developing. A skin specialist can perform a mole check to help you determine if your moles contain melanoma cells.
The characteristics of melanoma are defined by the ABCDE rule, which stands for:
- Asymmetry – Melanoma is often asymmetrical, which means the shape isn’t uniform.
- Border – It often has borders that aren’t well defined or are irregular in shape.
- Colour – The lesions are often more than one colour or shade.
- Diameter – Melanoma growths are normally larger than six millimetres in diameter.
- Evolution – They will often change characteristics, such as size, shape, or colour.