Get an acne spot treatment on a q-tip and dab a little on the pimple and sleep over night in the morning just wash it in the shower, if you take a shower at night use another q-tip with water and rub it off. Also make sure you clean your ears well. If it still doesn't go away Pop it, to reduce pain you can hold ice on it before to make it numb. Popping it will get out all the bacteria causing the pimple make sure after you pop it to was it to avoid more bacteria.
I have gotten those, as well as my son, and it hurts like H e double hockey sticks! What we do is use the end of a bobby pin (the closed end) and pop the black head out (and this hurts, seriously), but it gets it out and gone.