Coleen Nolan has been diagnosed with skin cancer.
The 'Loose Women' panellist, 58, said her sister Maureen pointed out a "tiny bit of skin" on her shoulder that looked potentially suspect, so she sought advice from a doctor.
Speaking on 'Loose Women' about seeing a dermatologist about "another problem", she said: "I went back in and he was very good and he said, 'Look, it's nothing to worry about. It is actually a cancer that doesn't necessarily spread, but you do need to treat it and we'll try it with cream and then the chemo cream and then if that doesn't work, we'll cut it out and give you a skin graft.' "
Coleen admitted her initial reaction was to "laugh hysterically".
She added: "It was so shocking my first instinct, typical me, was to laugh hysterically because I just thought that's the most ridiculous thing I've ever heard anybody say, because I'm sick of cancer.
"Also, my first instinct was, I'm not telling anybody in my family because this that I've got at the moment seems nothing compared to what my sisters have been through.
"And ... what Linda is going through, where it has gone to her brain and she's having chemo.
"It just seemed so pathetic for some reason to go back and go, 'Oh yeah, I've got a carcinoma.' "
Coleen's sister Linda Nolan has incurable cancer, which has spread to her brain, and the family lost sister Bernie Nolan to breast cancer in 2013 aged 52.
The pair's sibling Anne Nolan has also battled breast cancer.
Following Coleen's announcement, Linda wrote on Twitter: "Very proud of my little sis. She acted on her instincts, found something amiss and got it checked.
"If you spot something out of the ordinary for you, PLEASE get it checked. Don’t be frightened"
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