@ChickNanny13
I'm not sure if you have been reading another post somewhere and getting confused but the chicken is referred to as female by the OP several times in the opening post.
I would have said that the photos indicate there is a leg mite problem with that bird which may be getting infected, but Marek's disease can also cause such lesions, which can be cancerous.
My apologies, I stand corrected...The OP did refer to a female while CarolinaSunshineFlock is a Roo. Wonder how the OP's girl is doing and what she's done for treating. I'm still learning diseases, injuries & emergencies ... I hope I never have to deal with any but knowing you all are here with all your knowledge is very reassuring. I only have 4 BO at this time (limited space & living within town), they're Pets with Benefits .