I have a small lump on the top of my head which has been there for a while. now it randomly starts hurting, causing headaches & dizziness. what is it?

Headaches: The most likely cause of the lump is a sebaceous cyst or a benign skull tumor such as an osteoma or dermoid. Have a neurosurgeon evaluate the mass to give you some answers.

Cyst: mist likely it is s pilar cyst or a sebaceous cyst it can get large and it can get infected and that why it may start hurting my advice see a doctor might need antibiotics or other medicine