You guys must be so sick of me and my girl Tank xD but while I was grooming her today I noticed this funny lump on the outside of her hock. I've seen it before but it seems more swollen than usual and there was some white crusty stuff on it. That may have just been dry sweat though. Any idea what it is? No other horse I've seen has it:
See the swollen lump in the middle? Is it something to be concerned about?