Need help with identifying skin problem on the chicken chest

[April 12]

The chicken has a red bold spot on her chest for the last 3 weeks. I was applying Hen Hiller multi purpose ointment with no result. What can I do help her?

 

[April 12]

It can be skin infection and if it is, is it viral or bacterial?
I feed the he chicken cooked rice and beans, chicken feed 17% protein, and black larvae worms.
Chickens don't peck her chest, I keep it covered.
The coop is dry and cleaned every day.
The chicken doesn't have parasites.
Poop is normal.
Will appreciate any suggestions.

 

[oldhenlikesdogs]

Could be the start of a breast blister. Where is she roosting and on what? What do your next boxes look like?