Bruises on potatoes: is it enough to cut them away?. Black spots are usually caused by physiological disorders, pressure points in storage in spring and impacts.
Mechanical stress is usually to blame for this so-called black spot, says Daniela Krehl, nutrition expert at the Bavarian Consumer Center. “The dark spots described may not look appetizing – they are not a health concern,” she says in the Bayern1 report. Unpleasantly smelling, wet and already infected tubers should be “removed immediately”