would need to see a photo to get a better sense, but common things being common, i'd go with folliculitis/pimple. Even abscess or furuncle if larger. Other signs of an infection are warmth, redness, swelling. I once had a furuncle on my leg that required I and D, dermatologist did it in the office and it was pretty straight forward and brief. If lymphadenopathy, usually still not anything serious. I get intermittent and transient swelling in cervical and occipital nodes on the right side, especially after shaving.Sometimes I can feel the swelling and its uncomfortable. Other times its not noticeable. Anyway, probably not too much to worry about.