A new symptom of Covid-19 has emerged as doctors in Europe say they are noticing foot sores on a number of patients similar to chicken pox. They are blue patches on the feet (especially on children) which seems to be very common. At first they thought the spots may have been from similar conditions (or even spider bites), but now they believe they may be from blood vessels blocked off from the virus. If you see them, they could be a sign you have the virus if they come in conjunction with any of the other common symptoms. Call your doctor for advice.