Mareks causes lymphomas. Squamous cell (also called keratoacanthoma) is a skin cancer that is not related to Mareks or lymphoid leukosis viruses. Chickens can get quite a few different kinds of cancer, including adenocarcinomas and melanomas. Here is some reading...
The pictures (5and 6) could be a squamous cell carcinoma, which is a common type of skin cancer in chickens. Can you any other small ones on her? You might want to separate the nice silkie rooster for awhile, and place him in a pen or dog crate. He may calm down in time. I like having one...