The Founder Of Paula’s Choice Thinks You Shouldn’t Spend Money On Sheet Masks You Beauty ADVERTISEMENT Weirdly, no. The constellation of black spots on your nose aren't always blackheads. "All pores are lined with a layer of skin cells and have an oil gland attached. The skin cells and oil should continually move out of the pore to lubricate the skin. If the skin turnover is abnormal or oil production is excessive, then we see a problem where the dead skin and oil block the pore causing congestion," explained McDonald. So, that black colour we see is actually caused by oxygen in the air oxidising the oil within the pore.