I've had these small bumps over a large area of one of my legs for 4 years now. They're maybe 2-3mm in diameter at most and appear in clusters and are below the top layer of skin. They do not itch, it is not dry, they are skin-colored and cause me no pain whatsoever. They do not "pop" if squeezed and it has not spread over the course of four years. Every doctor I've been to, including one dermatologist, have not been able to give me any diagnosis on it other than general dermatitis and treating it with hydrocortisone which is it completely unresponsive to.