Importantly, these marks don't appear to be anything to worry about, as patients are otherwise asymptomatic-although it is unclear how long they stay for, having lasted from between one week to over four weeks in the cases reported.Ī few patients have also found new horizontal indentations in the bases of the nails of their fingers and toes, which are known as Beau's lines. Alternatively, it may be due to the immune response mounted against the virus causing mini blood clots and discolouration. A possible cause could be blood vessel damage associated with the virus itself. The mechanism underlying this half-moon patterning remains unclear. So having this pattern appear like this could exclusively be an indication of a COVID-19 infection. Red half-moon nail patterns like this are generally rare, and previously haven't been seen so close to the nail base. Multiple cases have been reported-but not many. This seems to present earlier than other COVID-related nail complaints, with patients noticing it less than two weeks after being diagnosed. One symptom is a red half-moon pattern that forms a convex band over the white area at the base of fingernails. Following a COVID-19 infection, for a small number of patients the fingernails appear discolored or misshapen a number of weeks later-a phenomenon that's been dubbed "COVID nails."
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