Skin doctors suddenly are looking at a lot of toes — whether by emailed picture or video visit — as concern grows that for some people, a sign of COVID-19 may pop up in an unusual spot. Boston dermatologist Esther Freeman expected to see skin complaints as the pandemic unfolded — various kinds of rashes occur when people get very ill from other viruses. “But I was not anticipating those would be toes,” said Freeman of Massachusetts General Hospital, who has viewed via telemedicine more toes in the last several weeks than in her entire career.