Doctors have identified a new symptom of COVID-19, caused by the novel coronavirus, informally dubbed “COVID toes.”

The new symptom – a presence of purple or blue lesions on the patient’s feet and toes – is puzzling infectious disease experts.

“They’re typically painful to touch and could have a hot burning sensation,” said Dr. Ebbing Lautenbach, chief of infectious disease at the University of Pennsylvania’s School of Medicine.