Cutting into a baked potato and seeing a black ring can look alarming, but it’s usually harmless. The discoloration is often an internal bruise — called an internal black spot — caused by pressure or rough handling before the potato reached the store. Temperature stress and natural oxidation can also darken internal veins, making the mark look worse after cooking.
In most cases, the potato is still safe. Trim away the dark area and check the rest: it should smell neutral, feel firm, and look normal. If it’s slimy, sour, green, or moldy, discard it.
To avoid surprises, pick firm potatoes without bruises and store them in a cool, dark, ventilated place. Most of the time, that eerie ring is just cosmetic — not dangerous.
