Aloha! You're speaking to Dr. Michael Salkin
You've described a skin fold dermatitis
. Here's a synopsis of how you might conservatively address it:
1) A weight reduction program should be initiated if Bella is obese.
2) Cleansing wipes (i.e., alcohol-free acne pads, body microbial wipes, chlorhexidine-containing pledgets, other anti-microbial wipes) used every 12-72 hours work very well.
3) Alternatively, routine topical therapy can be used to control the skin problem. For tail dermatitis, the affected area should be cleaned every 1-3 days as needed with an antibacterial shampoo that contains chlorhexidine, benzoyl peroxide, or ethyl lactate. The shampoos can be found over the counter in pet/fee stores or at Bella's vet hospital.
4) Topical application of an antibiotic ointment, solution, or spray every 24 hours for the first 5-7 days of therapy may be helpful. Prescription mupirocin or over the counter Polysporin (or generics) work well.
Tail amputation is usually curative. The prognosis for conservative care is good but lifelong topical maintenance therapy may be needed if surgical correction isn't performed. Please respond with further questions or concerns if you wish.