It’s the second time Katherine has been diagnosed with the disease.

Revealing that she felt uneasy about a mole on her arm, Katherine explained that during an initial visit to the doctor she was given the all clear.

She said: “I know you should never google things but I’m actually really worried. Normally I’m that positive person

“I think it’s really easy to take a diagnosis of ‘you’re healthy’ and walk away.

“But the mole kept changing, I know a lot about melanoma, I had melanoma as a very young woman – aged 21 – on my leg, I’ve spoken about that before.

“It was flat, it wasn’t that big but it was melanoma. It is a deadly form of skin cancer and it does spread quickly.

“I just thought that this mole wasn’t right. It’s on my arm. I showed pictures of it on my social media. I went in and I wanted the doctor to remove it and stitch it up in a straight line.

“But even when he looked at it, he was like, ‘it’s not melanoma, it’s totally fine, I will do a shave and send it away for testing’.

Katherine added: “And he rang me today and it did come back as melanoma. Early melanoma. The doctor was shocked and told me I need to go back.

“It just feels crazy to me, what could have happened, if I hadn’t been my own advocate – and I will continue to be my own advocate.”

Katherine’s first brush with melanoma came when she was 21 and studying at Toronto University.

She previously told of having a “golf-ball sized” lump removed from her leg.

Speaking to The Guardian, she confessed she was too young to take it in at the time, adding: “I just joked that it was free lipo.”