A narrow, deep injury caused by sharp pointed objects (nails, needles, teeth). High risk of deep anaerobic infection.
Step-by-Step Guidance
If the object (nail, glass) is still stuck, do NOT pull it out. Leave it in place.

Apply pressure around the sides of the object, not directly on top of it.

Pack bulky dressings or rolled bandages around the object to keep it from shifting. Tape them in place.

If the object is gone and wound is shallow, wash the area thoroughly with soap and water.

Consult a doctor immediately. Deep punctures are prime targets for tetanus bacteria.

1 - 3 weeks
Timeline is typical for uncomplicated healing. Always follow doctor guidance.