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Sounds to late for first aid. Simple First aid requires you to clean the wound, disinfect or sterilize it, apply pressure and a clean wrap every few hours. If this has been going on for 3 days you are past the first aid step and need to see a nurse or a doctor.
I would be concerned with how I got the cut. You may have an infection and suffocating the wound for days likely did not help.
Why would you cover it with plaster?
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