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Hi there. Sorry to hear about your injury. Did you lose consciousness, even briefly, after being struck in the head?
Did the injury cause a laceration or bleeding of the scalp?
The skull is relatively thick in the back of the head and designed to absorb most everyday blows. When a force is excessive, the scalp typically splits and bleeds and/or a person loses consciousness. In the absence of these things, or severe headache or dizziness, it is less likely that you have an emergency condition.
You would want to be evaluated right away if you developed headache, dizziness, visual changes, confusion, nausea or just felt really poorly. Otherwise you could monitor yourself (and have your family watch you as well) and go in if things worsen.
The front is also pretty thick. It and the back are the thickest parts.