Pink Eye Pink patches develop around the budend and eyes. The pink discolourationis usually skin-deep. If humidity is high, soft rotbacteria may invade affectedareas. Pink Rot Infected areas appear dark brown to purplishblack. The margin of the decay is often limitedby a dark line. Infected skin is easily rubbed off. The internal rot usually begins at the stem end and is cream to light brown. The rot has a texture similar to that of a boiled potato. Wheninfected tubers are cut, the flesh turns pink inabout 20 minutes and with time turns black.