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Puncture wounds can be very deceptive. Although the wound looks minor, there can be damage to the deeper tissues. Infection is always a concern, too.
If the tool you were using was rusty or had been in a place like the garage or barn, a tetanus shot may be required. Swelling can be a sign of internal bleeding even if no blood comes from the wound site.
Contact your physician and see if an office visit is advised. Most injuries of this type don't really require a trip to the emergency department. Simple first aid and close observation may be all that's required.
Antibiotics are not used to prevent infection. But if signs of an infection develop, early intervention with antibiotics may be helpful.
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