What is this? Abscess? Something else?
About a month ago, my horse blew an abscess through his frog. At least, I think it was an abscess. Now part of his frog looks yellowish and it's tender to the touch. Is this normal? What is it?
He is a 20 year old grade gelding. He's a little bit lame on that leg, but he also has arthritis in that fetlock. Our weather has been so back and forth from warm to freezing that the slight lameness may well be due to the arthritis. However, he does not like me poking the yellowish spot, especially near where the abscess blew.
In the second pic, I circled the yellowish spot in yellow. The green arrow is the abscess hole. The red line is a crack that has opened up on the side of the yellowish thing. Sorry for the pic quality and the mud. He doesn't like to hold that leg up for very long, and the pic was taken on a flip phone.
My farrier will be here Friday. The horse is due for a trim but not overdue.
Any ideas what this is?