I think these may be scrapes.
Buffs are heavy hens, they can bruise themselves from jumping from high heights. I suspect this is not a thorn or foreign body. The one on the bottom of the foot looks shallow? Sorry..I can’t see it very well. Looking at your roost situation, the height of the roosts or anything she’s jumping off of, and any substrate she may be getting into that would scrape her feet would be my first step. Make sure her feet aren’t constantly wet.
If the sore looks shallow (vs there is a foreign body in the pad), and there is no swelling the best thing is to leave it alone and watch for swelling. The scab may take a long time to slough off. Also, the scab may turn into a callous at some point so if that happens we take another direction.
Feeding a good diet with vitamins (the commercial feed) is important for foot health.
Try to keep the buff at a healthy weight, the heavier she is the worse the problem.
If you think it looks like there is a foreign body under that scab we Take another treatment direction.
My one bird (a buff o) that has bumblefoot has more of a chronic inflammation of one of her footpads that causes scabs. No foreign body there.