Welcome to Justanswer! I am Dr. Altman and happy to assist you both today!
So sorry to hear your dog has this lesion! I can definitely give you recommendations to minimize infection and reduce healing time but if there is any discharge or it is not healing then please have your vet evaluate the lesion to ensure additional medication is not warranted.
1.) No licking or scratching! If this area is reachable then please put a t-shirt on or a cone to prevent her from reaching the area. Licking introduces oral bacteria to the area and can increase risk of inflammation and infection
2.) Trim the hair around the lesion if your dog has long hair to allow the area to breath, especially in this area where moisture can increase
3.) Use ivory soap and water or dog oatmeal shampoo to the area twice daily with ten minute contact time before rinsing and tap dry
4.) I prefer to not apply salves or ointments because it traps in moisture to the area and reduces healing or delays healing time. If needed you can put a very thin layer of a triple antibiotic on the area after cleaning
5.) Remove any scabbing that occurs with healing. Again it also traps in moisture
6.) Limit activity. The more activity the more likely this lesion will take longer to heal because the skin cannot heal in an active setting, particularly where you describe
Please let me know if this information makes sense and any additional questions i can assist with or clarify today
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