I completely understand your concern and I hope I am able to help you for the same.
You seem to have developed an injury
to skin due to metal pieces.
First of all, you might need a tetanus
booster if you have not been vaccinated in the last 5 years.
Clean the affected area with lukewarm saline water.
Apply a topical antibiotic
cream twice a day.
You may need oral antibiotics
if the infection persists or increases.
For that, you should see s nearby physician.
Hope it helps
Best wishes for a speedy recovery
Dr Geetika Paul