Salkey, an assistant dermatology professor at Eastern Virginia Medical School, said that under the microscope, the affected skin resembles skin damaged by long-term sun exposure.

Now they've been found in something that bumps and grinds, visible with nothing fancier than a high school lab-issue microscope.

Instruments: Photoelectricity binocular microscope 1, provides by the Wuhan University medical school immunity pathology laboratory;