hello i have a small lump about half an inch below my left ear its approximately 3mm in diameter and is painful to touch or lean on. ive had it keep reapearing every couple of days after it goes away it last about 3 days then goes away then comes back a day or two later. Have been looking it up and its either a cyst or cancer can i please get some verification on this. thank you guys...

Heres somethings about me

 im and 18 yr old male

 semi long hair

works out 

 showers and cleand face and ears regularly

 into free running.

does any of this cause it or anything would love to settle my worries. Thank you guys