My hen has a large round mass in her foot

[TannerTrue]

Use PRID from Amazon and it will be resolved in a few days

I use that every time as well. Soak their foot in Betadine, apply Prid and bandage well. Repeat daily. Walmart stocks it in the first aid section.

 

[ChickNanny13]

I posted a thread weeks back ... Same like yours, no scab but the lump on top. Here's the link to the thread ... https://www.backyardchickens.com/threads/another-bumble-foot-question.1585166/. Epsom Salt soaks, Prid & wrap which is probably what drew the gunk to the top. Her foot/top has no sign of anything now.