The list of possible coronavirus symptoms continues to grow.

Most recently, doctors have found patients who have tested positive for COVID-19 experienced mysterious side-effects such as gangrene, rashes, and ulcers.

In Italy, an 86-year-old woman’s fingers turned black due to gangrene, an infection caused by the lack of blood flow.

After amputating three of her fingers, doctors said the symptom was a “severe manifestation” in a report published in the European Journal of Vascular & Endovascular Surgery. “She had no other clinical manifestations of COVID-19,” the report noted.

COVID-19 has been known to cause blood clotting, and doctors believe that the side effect may be related to an increasingly common immune overreaction known as a “cytokine storm,” which finds the body attacking sickened cells and healthy tissues alike, per The New York Post.

The CDC website notes that the most common symptoms of COVID-19 include fever, body aches, troubled breathing, and nasal congestion. Additional symptoms may include nausea, vomiting, diarrhea, and the tell-tale sign of not being able to taste or smell.

However, Tim Spector, a researcher at King’s College London and a professor of genetic epidemiology, found that at least one in five patients have also reported less-common symptoms such as skin rashes, mouth sores, and enlarged tongue, which he calls “COVID tongue.”

Spector has been collecting data through the ZOE COVID Symptom Study in the UK, which relies on self-reports from patients.

Per USA Today, he said 1 in 100 people have experienced the rare phenomenon of a swollen tongue, which is one of the rarest symptoms he’s observed, “affecting less than 1 in 100 people,” he estimated.

“Seeing increasing numbers of Covid tongues and strange mouth ulcers,” he tweeted last month.

With bizarre side-effects popping up quite frequently as the world battles the novel virus, the CDC website does feature a warning that their list “does not include all possible symptoms” and adds that it will be updated as they learn more about the virus and its mutations.

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