Been having slight throbbing pain in the back top left hand side of my head, it comes and goes also have 3 or 4 pimples on the back of my head on that?

2 separate problems: 1. Possible migraine. Any migraine must be viewed as a valid medical disorder and the headache assessment must be comprehensive. Once a diagnosis of migraine has been made, effective management of migraine should be initiated. 2. Scalp pimples could be hormone or stress related. If concerned see your PCP for evaluation. Good luck.