Dermatology Questions? Ask an Online Dermatologist.
This is Dr. David
I am sorry you are having a bump below your hairline on the back of the head
this can be a hard area for you to feel and examine yourself
it probably is difficult to even take a photo of the area
it sounds most likely to be a subaceous cyst or ingrown hair follicle
it would be best to see a doctor who can look at that area and tell you for sure what is going on
seeing a doctor face to face, the doctor would be able to feel and look at the area directly.
do you have a doctor you can see?
can you upload a clear jpg photo of the area so I can see what you are feeling?