It is important to keep an eye on your moles in case of any changes that could indicate skin cancer.

While most moles are harmless, it is important to be aware of any changes, such as size or shape, that could be a sign of melanoma.

With comedian Katherine Ryan revealing her skin cancer diagnosis last week, the UK's go-to mole expert, Dr Ross Perry of skin clinic chain Cosmedics, highlights the 'ABCDE' signs of melanoma.

Asymmetry: You should get your mole checked if you have noticed it has changed shape. These moles look a bit lop-sided. They are different shapes and/or sizes from left to right.

Borders: When inspecting your moles, don't forget to also look at the borders. If they are uneven, scalloped or notched rather than smooth, then this might indicate an early melanoma.

Colour: Another warning sign of melanoma is a change in the colour of your moles. Moles should be a fairly uniform block of colour. Any variation within a single mole is another warning sign - those colours can include brown, tan, black, red or blue.

Diameter: If you notice that you have a mole that is larger than normal, you should have it looked at by a doctor.

"If the mole is larger than the size of a pencil eraser, then it is cause for concern," Dr Perry explains.

"However, early melanomas might start out smaller than a quarter of an inch, so don't discount any that are suspicious yet small."

Evolving: Evolving moles should not change significantly in appearance, and if they do, it could be a sign of skin cancer.

"Any moles which seem to be changing in size, shape, colour or height are deemed risky,” adds Dr Perry.

“Also, watch out for itchiness, discharge, bleeding or crustiness," the expert warns, pointing out that moles should not bleed unless they've been caught on something.

Overall, you should always be suspicious of a new mole, growing moles, the darkest ones on your body and irregular shapes/borders. Remember the golden rule of "if in doubt, check it out" and seek advice from your GP if you're concerned about a mole.