possibility to cauterize a wound in emergency cases (scratch, cut)
This way is like a 50/50 heads and tails game, you can either make yourself better or hurt yourself more.
EXAMPLE: You have cut yourself or been pushed by a zombie, and you have a large wound that is not healing quickly, whether you have bandages or not.
Cauterization - A manipulation consisting of applying a localized superficial burn or causing deeper necrobiosis, up to and including scabbing, using heat, electricity, radiant energy, or chemicals for therapeutic purposes.
For example to stop bleeding too (which zombies run to smell) which takes a very long time to disappear or to cauterize a laceration which takes a very long time to heal.
And if you hurt your leg and can barely walk, cauterizing the wound can increase recovery.
( all of the above is not something I made up or took from movies, I went through a lot of docs' documentation and found enough information that cauterizations really help)