Sorry for late reply and inconvenience.
Thanks for the follow-up.
I understand your concern.
As per your description,if nail had hit you superficially and it was not stuck inside your head so chances of serious head injury are very slim.
You should watch for symptoms like nausea,vomiting,headache,nose bleed,blurred vision,abnormal eye movements,a loss of muscle control for next 24 hours.
You should take OTC Tylenol.
Also apply cool compresses on welt and bruise.
You should maintain a good hydration with Gatorade.
You should take proper rest for few days.
Gradually change your position from sitting to standing.
Avoid any strenuous physical work out.
You should apply OTC Hydrocort cream and polymyxin b ointment/polysporin ointment on welt.
In most of the minor head injury,symptoms resolve in few days.
In case your symptoms'll not show improvement or get worse then see a doctor at emergency room for prompt management.
Feel free for further queries. It's good to discuss rather than quit.
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