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My sister turtle has am wound on the arms
The turtle is about 21 years old,
It spends time in water and out side,roaming around the living room,
The water tank dose not have a thermometer,or a Filter,she changes the water every few days,the filter is broken
https://m.imgur.com/a/DQpI4tc

I don't see a picture. Any idea how it happened? Any other turtles kept with her?

She saw him yesterday,no there no other turtle with him,she has two of them but they are not staying, together since they fight each other.
https://photos.app.goo.gl/mzgMoNteemYqF2767

She's a sweet looking turtle. I can't tell the severity of the arm wound, is it the part thats right next to the shell? The part looks a bit reddish?

Yes,that is the wound,

It she using it normally? Any new sensitivity to it?

In water i have seen him moving them,out side he sits around not moving much
https://photos.app.goo.gl/xUKdPtHB1LxntuMx8

Is it a scab? Is it an open wound or bleeding? Not all turtles like to move around outside their tanks, is this a sudden change in behavior?

It is a wound from overgrowing her shell,my sister went with her to the vet,he give her two injections,had she will have to eat one a week.
Today she moves around a lot,a she usually dose

The shell doesn't look overgrown to me, but that doesn't mean she couldn't be injured from it. Hope she heals quickly!

external injuries are often healed without any special treatments... one of the perks of being a reptile and regenerating your skin I suppose Hope she heals quickly