Professor Tim Spector has said that people may notice changes to their fingernails after a Covid infection.
Professor Spector, who is the principal investigator of the Zoe Covid Symptom Study app, said that the difference can happen even if you did not experience any other symptoms of Covid-19.
Here’s what you need to know:
What do ‘Covid nails’ look like?
Professor Spector noted that people who have a "clear line", which creates a prominent ridge, growing out of the nail may have had Covid before.
People may also notice discoloration under their nails if they have previously had the virus.