Rural Gardening: My chick has a red "blister". Anyone know what it could be?, 1 by Penannophia

Penannophia wrote:
Hi All, my chicks seem to be happy and healthy. They are starting to bond with me too...two of them will sit very contentedly in my hand now. I love watching them play Keep Away with green peas. Attached is a photo from yesterday....I think they are going through a growth spurt!

I have a quick question for everyone: does anyone have glassboard floors in their coop? It would be an extra $80 in the coop. I feel like I could just cut a stall mat ($37), or use vinyl stick on tiles from Home Depot (Free since I have some old ones leftover from a long ago project) and have a perfectly good floor. Anyone have a preferred flooring for their coop?

Thank you!