It's the syem starting to grow and the buds are the start of leaves. When we grow them, we leave these on to the potato plant a faster start. We are starting into the potato growing season, so it is likely happen. Also the place you store them maybe to warm and encouraging them to start growing.
For cooking just rub them off.
"For to be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others." - Nelson Mandela