She could have knocked the scab off. Daughter's colt had a NASTY gash on his knee that has taken months to heal. He got out the other day and our neighbor caught him in our front yard and noticed that his knee was bleeding. She's not a horse person, and she was panicked. She put him in the lot (we were weaning from his mother, who was in the lot - but the neighbor didn't know that.) The colt's knee was bleeding (but not badly) because he had knocked the scab off. There was no new damage.
You do want to be sure that your horse's cut heals from the inside out and does not close up too soon. If it closes too soon, it could seal harmful bacteria inside and cause a serious infection. Back in my day, we used Granulex to help keep a horse's wound open and dissolve necrotic tissue in order to speed healing (aka granulation.) I don't know what is recommended now, but I was sure glad that Granulex is still on the shelf of our local feed store!
Plain Old Dee, horses Dancer and Rain I believe in dragons, unicorns, good men and other mythical creatures!