In all the years I've raised chickens and seen bumble foot, this was the first time I treated due to her choosing to sit and when she walked it was limping for a short distance. The Vet advised me to soak in Epsom Salt to relieve the inflammation and swelling, there was no scab. The "eye" showed its self after about a week of soaking, I should have waited another couple of days soaking before I squeezed, maybe it would have "soften" more. It hurt her but I saw the relief she had once I got it all out. I used the method I read about here, thinking the salicylic acid may be ok to use aside from the Prid ...
https://en.wikipedia.org/wiki/Salicylic_acid