It may or may not be a lipoma. Only a dermatologist could say what it is. 

All we can tell is that it is a bump

do you recall any injury to this part of the head? maybe you got hurt during the time you  were sleeping and you were not aware of it? in any case, if the situation persists you should check with the doctor.

Pimple. Zit.

Wipe it with alcohol on a cotton ball after you shower. Repeat this until it's gone.

Alcohol dries it out and disinfects.

Or pop it and put Noxema on it and let it sit. After 10 minutes, rinse.

By the next day, it will be healed.

Quick fix remedies.