https://www.mercurynews.com/2020/05/04/what-is-covid-toe-maybe-a-strange-sign-of-coronavirus-infection/ > Before the coronavirus outbreak, Dr. Lindy Fox, a dermatologist in San Francisco, used to see four or five patients a year with chilblains — painful red or purple lesions that typically emerge on fingers or toes in the winter. > Over the past few weeks, she has seen dozens.