Hello,
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I can help with your care that you need to provide your mare. First, the excess skin will dry up and drop off. New skin will grow to cover the wound.
Your most important thing you need to be doing (and you mentioned you are providng this) is making sure the wound stays clean. For cleaning and for help in healing the wound, I would hydro the wound for about 20 minutes per day. Water is a wonder drug for wounds. While running water on the area, see if you can clean it with Betadine Solution and after you rinse it off, make sure it is dry before applying an antibiotic ointment. You need to be sure you don't get "proud flesh" so I like to mix Betadine ointment and Furisin mixed together.
If you see any greenish discharge from the wound, you will need to treat it as an infection and get her on some antibiotics. Sounds like you are keeping it clean and hopefully with this information, you won't see an infection.
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