Hill was understandably gobsmacked by the news as she only recalls being sunburnt as a small girl.
She still remembers receiving the phone call from the doctor's surgery like it was yesterday.
"Hello Alannah, could you come back to the surgery please? We have something we need to talk about," she told Fairfax Media.
"The flipping over of my heart could be heard for miles."
Hill has had part of her toe removed and a skin graft from her inner thigh and then after about a week doctors will decide if she needs anymore treatment.
Upon her doctor's insistence, Hill is taking a three-month break from her new clothing label - Louse Love - she severed all ties with her famous namesake label, that she started two decades ago, in 2013.
Hill admitted that she hadn't got around to getting her freckle checked due to her busy lifestyle.
"The main thing to remember - and I can't stress this enough - is that we all, unfortunately, believe we are invincible," she said.
"No matter how small your little mole is, no matter how insignificant it looks, go to your doctor and get it checked."
Hill couldn't stress enough how humans have a bad habit of feeling invincible.
She said her reason for not wanting to talk about her cancer was that she didn't want people to pity her.
But her doctor urged her to get the "message out" after telling Hill heart-wrenching stories about all of the patients he has seen who had left it too late.
- Daily Mail