Hello, I am a 29 year old woman, the back of my head on the right side has been extremely tender for about 2 months now, i have been to 2 diff Dr.s one thought it was cellulitis and the other totall misdiagnosed me with shingles, my scalp is completely healthy no scratches or opens wounds on it. But it is very tender to the point i cant lay on it and when move my head it worsens, could this be a tumor? If not what could it be?