Here’s what causes skin tags and moles—especially around the neck and armpits. Check this out. Timestamps0:00 Skin tags and moles 0:10 Causes of skin tags and moles 0:35 Insulin In this video, I’m going to talk about skin tags and moles. It’s basically a really tiny benign tumor, and it’s triggered by growth factor, which is triggered by insulin. This is why, in some cases, diabetics and prediabetics start getting skin tags around their neck or armpits. Insulin is the hormone that regulates blood sugars. But, if you continually eat sugar, or you eat too frequently, you can raise insulin to the point where you have insulin resistance. Now, you can have too much insulin. Insulin is anabolic and makes things grow, so it can start causing skin tags.