see how the antiseptic works.
our little 'un had a big bleeding hole behind her ear... one squirt with purple antiseptic and its healed beautifully - and did eventually washed off me, though not where I got it on the path spraying a sore hoof (moving during trimming, and it tore!)
so its good stuff!
check round to see where she might have caught it - loose wire, nail or screw, or if she is getting sores on her body