Currently in my house we have
Sweatheart - always begging for attention
Mama Chilla - our oldest rabbit and is a Chinchilla
Whitefoot - he's all black except 1 foot and a little white on his face
Koko Eve - our youngest and future momma Koko is native American for night/black and Eve is the...
Siblings that were split for fostering (one doe is a great mother but lost her only kit so to help the new mom and give the runts a better chance I split them) and these pictures are a couple days apart. All are less than a week.
It looks like readigrass is like orchard grass but has mostly ryegrass. From my research ryegrass is safe for rabbits.
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Don't even try to pop it. Not only would it be extremely painful but it could spread the infection to more than just his "skin" Unless a vet suggests otherwise I'd clean it up to once a day and leave it alone till gone
Diatomaceous earth is safe for furry and feathered friends.