So I have 2 hedgehogs. My first one Kai (who wasn't bred well) is quite slender and very active. My other hedgehog Leonie is active but more bulky than Kai. A couple days ago I noticed a lump on the scruff of Leonie's neck and today it looked smaller. Does her back look normal to you? I usually compare both my hedgehogs with each other (if they ever have something unusual going on).