Hello, I have the same condition happening on my hen. She had a few cuts a couple of months ago but was still eating drinking and was fine with the flock but now over the past several months I finally see that is it a hard growth, some scabbing. I had her in a warm epsom salt bath to see if the chunk would fall off but it did not. I only cracked a small piece off. Didn't want to pull it off and have her bleed. I'll put more antibiotics on her today but she is still eating & drinking. She is in a crate now. The only thing that bothers her is this 2" cone like clump, I thought it was clumped up dirt at first but it's not.