I went to my GPs a few months ago and he had no idea what it was and prescribed a 'topical ointment' (for acne I believe) and it did absolutely nothing.
papule of the nose, trichoepithioloma or actinic keratosis. Since it has been present for a long time without any change, so these possibilities need to be evaluated for which I suggest you to consult a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.