It's not just the size and shape of a mole that could indicate deadly skin cancer — everyone should watch out for how they feel too, a top dermatologist has warned.

Melanoma is the UK’s fifth most common cancer, as well as the deadliest type of skin cancer.

Experts have long urged the public to watch out for the growth of a mole, as this is a telltale sign that it may have become cancerous.

However, according to Dr Conal Perrett, consultant dermatologist at University College London Hospital and The Devonshire Clinic, there are other red flags that are less well-known.

For instance, a mole that becomes itchy, painful or tender 'should not be ignored', he said.

Additionally, moles that 'bleed, become sore, or start to weep fluid' are alarming signs.

'These symptoms could indicate that the mole is undergoing cancerous changes.'

It's not always a change that should warrant a trip to the GP for a mole check.

'Any mole larger than 7mm in diameter should be assessed by an expert,' said Dr Perrett.

'Larger moles have a higher risk of becoming cancerous.'

Other, better known signs of a cancerous mole include rapid growth, colour changes and alterations in shape, Dr Perrett said.

'If you notice a mole increasing in size over a few weeks, it's important to get it checked. 

'A mole that changes its colour or develops multiple colours—such as shades of brown, black, red, white, or blue—should be examined by a medical professional. Uneven colouring can be a warning sign.' 

Equally, moles that become 'irregular or asymmetrical', may indicate skin cancer, he said.

'It's important to monitor moles for any changes in their borders or overall symmetry.'

 Dr Perrett said it’s vital to take melanoma scares seriously as it can quickly spread to internal organs, when the chances of survival are greatly reduced.

‘Once melanoma has spread to other organs, the outcomes for patients are significantly worse.

'[The disease] is responsible for over 2,000 deaths a year in the UK.' 

Melanoma is caused by cellular damage from UV and UVB rays from the sun and tanning beds, but those with a family history of the disease are at greater risk.

Awareness of this type of cancer is increasing, partly spurred on by celebrities including Hugh Jackman, 56, Katherine Ryan, 41, Khloe Kardashian, 40, and Molly-Mae Hague, 25 openly sharing their diagnoses.

A common misconception is that melanoma solely affects the skin on the face, body, and limbs, but it can also develop on other areas vulnerable to sun damage — the mouth, scalp, nail beds, soles of the feet, palm of the hands and fingers. 

To avoid the disease, experts advise using sunscreen with a high SPF, applying it 30 minutes before going outside, covering up as much as possible to avoid sunburn, and keeping babies and children out of the sun.

Medics also advise those with moles to visit a GP every year for a skin health check-up.