One of my speckled Sussex, 9 mos old, yesterday morning appeared with a large (size of a jumbo egg or a little bigger) yellow clump frozen to her backside below her vent. Initially I thought she had sat on a broken egg or laid a shell-less egg and it just froze to her fluffy butt feathers. I went out with a bucket of hot water and a wash cloth, set her on my lap and carefully wiped until it loosened and came off. I did notice a large (nickel-size) red lump near her vent, but I thought it was just irritated by the stuff that had been there. I dried her off and set her in the coop to recover. She promptly went right back outside to join the rest of the gang. I know she laid an egg that day because I collected the full allotment (13 hens - 13 eggs). She's eating, running and roosting just like all the others. This morning she appeared with a new frozen yellow clump (smaller than yesterday's). I had to work today so I did not have time to attend to her this morning but will later this afternoon. Since it recurred, I am assuming the red spot could be some type of infection and this yellow stuff could be drainage from it? Or is it a poop-related problem? Any idea what this is and how I should treat it?