ControlNet on specific area

[waquey]

Dear great author,

Thanks for the fantastic work! I would like to ask a question. Assume that the controlled photo contains a man and a dog. Is it possible to apply ControlNet just on the man but not change the dog? For instance, if my command is "add some red spots on the man's face" and the result photo is a man with red spots and the dog

Could we use positive/negative prompts to control it? Or shall we retrain ControlNet to do so?

Thanks