Purple lines appearing on models

For some reason, I notice I sometimes get these purple lines that appear along the vertexes of my models. There seems to be no sure-fire way of causing it to happen, but most often they show up when rotating the view in the editor or the in-game camera, and they tend to flicker in and out of existence. It doesn't even seem to matter which shader I'm using. I managed to get a screenshot at just the right time to show a few, which I've circled in red: If anyone knows what's causing this and how to fix it, or if more info is needed, please let me know.