Experts have revealed five signs which may prove you have previously tested positive for covid-19.
According to the ZOE Covid 19 Symptom Study app the five ways you can determine these signs are by lines on your nails, reports BirminghamLive.
Horizontal lines - known as "Mees lines" - are one such symptom.
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Grooves across the fingernails, around five millimetres from the nail bed, are also a common indicator.
A half moon which is visibly red in colour can also be significant.
And so can orange nail tips , with discolouration presenting in patients on the continent.
The final sign is nail lifting, or onychomadesis , which is the loss of a nail from its root without any pain or swelling.
One expert has warned: "There’s another part of the body where the virus appears to have an impact: the fingernails.
"Currently, the available evidence suggests that there’s no association between the severity of Covid-19 infection and the type or extent of nail changes."
And Prof Tim Spector, lead of the Symptom Study App, has warned: "Do your nails look odd? COVID nails are increasingly being recognised as the nails recover after infection and the growth recovers leaving a clear line. Can occur without skin rashes and appears harmless."
The tweet from Prof Spector has been shared widely since he posted it months ago, back in May of this year.
