If the skin has green on it, it has a mild toxin in it. I've heard that it is harmless if cooked, but couldn't find a ready source for that.
The following is from an University of Illinois Extension website...
The following is from an University of Illinois Extension website...
Q. What causes green skin on my potatoes?
A. The green areas on tubers develop where the potato was exposed to the sun. This condition occurs when the potatoes were not planted deeply enough or not covered with straw. The green portions taste bitter because they contain a moderately poisonous alkaloid. These green areas should be cut off and discarded. Exposure of potato tubers to fluorescent light or sunlight causes greening during storage.
http://urbanext.illinois.edu/veggies/potato1.html
A. The green areas on tubers develop where the potato was exposed to the sun. This condition occurs when the potatoes were not planted deeply enough or not covered with straw. The green portions taste bitter because they contain a moderately poisonous alkaloid. These green areas should be cut off and discarded. Exposure of potato tubers to fluorescent light or sunlight causes greening during storage.
http://urbanext.illinois.edu/veggies/potato1.html
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