Comedian Katherine Ryan has opened up about a medical misdiagnosis she experienced before being informed she has melanoma. The telly favourite broke the devastating news of her skin cancer's return on a recent episode of her podcast. Katherine had previously been diagnosed with melanoma and was initially given the all-clear when she went to have a mole on her arm checked out. She decided to see a doctor due to concerns over a mole that "kept changing". The podcast host confessed: "I know a lot about melanoma, I had stage two 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." However, when Katherine visited her doctor, she received an unexpected response. She was assured that she didn't have melanoma and was "totally fine", reports the Mirror . Katherine shared: "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'." However, the doc soon rang her back to confirm it was indeed melanoma. Katherine shared that it was early-stage melanoma and the doctor was "shocked" he hadn't identified it sooner. On her podcast, Telling Everybody Everything, she revealed that the medic who removed and tested the mole was actually the second healthcare professional she'd consulted about it. She said: "I'm covered in about 5,000 moles and I had melanoma when I was 21, I had a golf ball size of my leg removed. "The melanoma, obviously, wasn't that big but they do at least two centimetres on each side to make sure they get all the borders. It was stage 2 at the time which I'm told would be downgraded to stage one now the way they define it. I had no lymphatic involvement but once you do, melanoma is so aggressive and it spreads so fast." She continued: "I went in to the Cadogan clinic. If you go private with anything, you know, try to set aside as much money as you can for these private healthcare emergencies because, it was not an emergency, but I know if I went through the NHS they'd be like, 'meh it's fine' and I did have this mole looked at for like £200 by a private clinic near Harley Street and the guy – the consultation was seven minutes long – and the guy was like, 'no that's no melanoma it's blah, blah, blah' – I forget the name he used. "But it's an inflamed, very red changing big mole. And I thought, 'no I'm not just gonna take...' cos it feels nice to get an answers like that, 'no it's not melanoma'... 'oh great well I'll be on my way' but you can't just walk away with an answer like that. If it's different, if it's changing, if it's on your body it's just better safe than sorry." Katherine explained: "So I rang up the Cadogan Clinic and they have a plastic surgeon there and a dermatologist – I think they're known for lipo I don't know why Cadogan came up but it's near Harrods, it cost me a grand but I was like, 'I wanna go in on exactly this Friday that I have off and I wanna get the mole removed' and they were like, 'bet'. That's what I love about private healthcare. "And this guy was like, 'Oh yeah it does not look like melanoma to me' he explained to me, 'there is a little freckle sized thing on the bottom of it that I'd like to maybe take a look at but I think it might be basal cell carcinoma if anything but maybe not'. He used some other word that I didn't know but he said, 'you know there is something that is inflaming the surface of this mole and you don't like it let's take it off'. "Normally when I have had moles taken off, they cut all around them and it is pretty deep and then they stitch it into a line and the scar heals in one straight line. But this guy was like, 'oh it doesn't have to go that deep we will just do a shave removal', which is still a little bit deep. The difference is they don't stitch it up together in a line so I have a hole in my arm that is way bigger than I thought it was going to be." For the latest breaking news and stories from across the globe from the Daily Star, sign up for our newsletters .