A small bone hard lump on the of my head. about the size of a dime. it is painful to the touch but not otherwise. is this a tumor? or is it benign?

Tumor: By definition a tumor is a mass, either benign or malignant. On the top of the head, a lesion the size of a dime falls into the benign group of tumors. It can be a true bony lesion or osteoma, a small fibrous tumor, a dense lipoma or cytst. Malignant tumors here usually ulcerate the skin. If it grows or becomes painful then biopsy is indicated.