Any home remedies for my dog's bleeding chin?

My English Mastiff has a problem with acne under her chin (diagnosed by a vet). Over the last month or so she's gotten into the habit of scratching her chin, or bumping it, and the acne bumps start bleeding. She doesn't seem to be in any pain, doesn't flinch when I examine her, but I would like to know if there's any home remedy's that can relieve the problem? I lost my job a few months ago, and want to try to heal her at home than take her to the vet for something minor if I can help it. Any advice is welcome! Thanks!