In the middle of my flipping forehead. It’s not acne/pimple because it’s been there a few years. It’s a perfect circle, about 3mm across and fairly flat. It’s the same colour as my skin, not red or brown like a mole. It doesn’t feel sore or full of puss. What could it be and how can I get rid? I’m worried people might think it’s a wart!! Ps I’ve tried taking a photo but it doesn’t show up particularly well.