Hi Hamed,
I have the same problem .. I have pain in the same area, but its not a pimple and the skin looks fine., The cartilage beneath it hurts. Light-weight earphones in the ear for more than 10 mins aches it. I am curious if you had a diagnosis to your problem, and if so, what could it be ..
Thanks,
Sandy
It very well could be a pimple...some never come to a head, thus you have to play the waiting game.
You could try applying a hot compress to the area to see if you can bring it to a head.