I have a white hard bump on top of my head that i noticed about 4 weeks ago, my wife says it looks like a wart. it is hard to the touch but does not h?

Blocked gland?: A sebaceous cyst is a collection of oily fluid that occurs when an oil gland is blocked. Some folks are more prone to them than other and they often appear on the neck, shoulders, and back. Try to avoid skin products that are oily. I would also stay away from transfats and bad oils, which is good for overall health. See doctor for diagnosis. It may be something else. Peace and good health.