The 41-year-old comedian opened up about her diagnosis in the latest episode of Telling Everybody Everything, marking the second time she has faced the disease.
The TV star shared that she was initially concerned about a mole on her arm but was reassured by her doctor that it was nothing to worry about.
She shared: “I know you should never google things but I’m actually really worried. Normally I’m a 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,” Ryan continued.
“It was flat, it wasn’t that big but it was melanoma.
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Skin cancer symptoms, causes and how to avoid getting it
“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’.”
What is skin cancer?
Skin cancer is one of the most common cancers in the world, but do you know the symptoms to look out for or what causes it?
People all over the world have been affected by skin cancer including the likes of Duchess of York – Sarah Ferguson, Australian actor Hugh Jackman and radio DJ Chris Evans.
There are two types of skin cancer – melanoma and non-melanoma.
Melanoma is a type of skin cancer that can spread to other areas of the body, according to the NHS.
While non-melanoma skin cancer, NHS inform says, refers to “a group of cancers that slowly develop in the upper layers of the skin” .