A spokesman for the Duchess said: “Following her diagnosis with an early form of breast cancer this summer, Sarah, Duchess of York has now been diagnosed with malignant melanoma.
“Her dermatologist asked that several moles were removed and analysed at the same time as the Duchess was undergoing reconstructive surgery following her mastectomy, and one of these has been identified as cancerous.”
The Duchess recuperating at medical spa in Austria
The Duchess received the diagnosis just days after Christmas. Since then, she has spent time recuperating at the MAYRLIFE clinic, a medical spa in Austria.
The clinic, which is nestled on the shores of Lake Altaussee, offers various health programmes and attracts wealthy A-list stars.
The Duchess’ father, Major Ronald Ferguson, was diagnosed with skin cancer just months before his death in March 2003 and had planned to undergo chemotherapy. He also had prostate cancer although he died of a heart attack.
Four years earlier, in October 1999, Carolyn Cotterell, the Duchess’ closest friend and flatmate, died from skin cancer.
The Duchess of York was diagnosed just before Christmas. Photo / Getty Images
Princess Beatrice, the Duchess’ eldest daughter, is patron of the British Skin Foundation and has worked with skin cancer patients.
The Duchess’ spokesman said: “She is undergoing further investigations to ensure that this has been caught in the early stages. Clearly, another diagnosis so soon after treatment for breast cancer has been distressing but the Duchess remains in good spirits.
“The Duchess wants to thank the entire medical team which has supported her, particularly her dermatologist whose vigilance ensured the illness was detected when it was.
“She believes her experience underlines the importance of checking the size, shape, colour and texture and emergence of new moles that can be a sign of melanoma.”
The spokesman told the Telegraph that the Duchess was “very resilient” and determined to carry on, despite everything that had been thrown at her.
She is being treated by Dr Andrew Furness, consultant medical oncologist at the Royal Marsden Hospital in London, and Catherine Borysiewicz, consultant dermatologist at the King Edward VII Hospital in London.
The cancer news comes as the Duchess has enjoyed something of a public comeback in recent months, having won plaudits for speaking openly about her breast cancer diagnosis and encouraging other women to get themselves checked.
Sarah Ferguson has been active in the public eye recently, including a stint on This Morning. Photo / ITV
In November, she is said to have impressed ITV bosses after co-hosting and guest-editing an episode of This Morning.
The Duchess appeared on the daytime show as an agony aunt, telling viewers she was there to answer any questions about “love and relationships and having hard times”.
Speaking to two callers during the segment, she suggested they reignite their spark by spicing things up in the bedroom with some “lovely saucy underwear”.
Last month, she was permitted to join the royal family on the traditional Christmas Day walk to church at Sandringham.
It was the first time in more than 30 years that the Duchess had been allowed to join the high-profile outing and was considered a clear sign that she had been welcomed back into the fold by the King.
The monarch, 75, is said to appreciate the loyalty she has shown to her ex-husband, the Duke of York, with whom she still lives at Royal Lodge in Windsor.
She continued to champion him throughout the fallout from the Jeffrey Epstein scandal, as he faced a civil lawsuit from victim Virginia Giuffre, who accused him of sexual assault, and was stripped of his honorary military titles and patronages.
