It's been there for a full two years and hasn't changed? That does need to be looked at by a dermatologist. While it isn't probably the case, you want to rule out skin cancer. There are different forms of skin cancer. Melanoma (the main scary one which this does NOT sound like) but also basal cell and squamous cell. Again, doubt it is but you need to rule that out. https://www.webmd.com/melanoma-skin-cancer/guide/skin-cancer#1. Can you see that specialty?