I emptied a pot of Home Guard potatoes for my lunch today, enough for two meals from one tuber.
However, most of the tubers were covered with tiny white 'pimples'. They are about the size of a cabbage seed. They come away with the skin if you scrape them a bit. Beneath the skin there appears to be no damage to the flesh and they taste wonderful, and I haven't dropped dead yet!
Does anyone have any idea what it is? I've never seen it before. I've looked through all the potato problems on the Cornell University site but nothing on there seems similar to what I have.