I'm sorry to hear of this with Mamba. There are quite a few therapeutic considerations forr the feline eosinophilic dermatitis/granuloma complex which can take the form of “rodent ulcer” or “fat chin disease" in addition to steroids and so I'll post my complete synopsis of them for you. Please take your time perusing it and then return to our conversation with further questions or concerns...
1) Any secondary pyoderma (bacterial skin infection) is treated with antibiotics for 2-4 weeks.
2) Any underlying allergies should be identified and managed - especially flea allergy dermatitis. A month long oral nitenpyram (Capstar) trial may be the only manner in which to prove a link to flea saliva allergy in some cats.
3) Systemic antihistamines may reduce clinical symptoms in 40-70% of atopic (allergies to environmental allergens such as pollens, molds, dust, dust mites, etc.) cats. A beneficial effect should be seen within 2 weeks of initiation of therapy.
4) Cyclosporin – an immunosuppressive drug – can be administered every 24 hours until beneficial effects are seen (approximately 4 weeks and then the dose is tapered down).
5) Systemic glucocorticosteroids (prednisolone, dexamethasone, triamcinolone, e.g.) may produce a rapid reduction in lesion severity and pruritis (itchiness).
6) Alternative medical therapies that may be effective include the antibiotics doxycycline or trimethoprim sulfa, oral essential fatty acids, surgical excision, and laser and radiation therapy. The prognosis is variable. Cats with underlying allergies that are managed successfully have an excellent prognosis. Cats with recurring lesions for which no underlying cause can be found usually require lifelong therapy to keep lesions in remission. These cats have a poorer prognosis as they may become refractory to therapy.
(Plastic bowls – although often incriminated – haven’t been shown to be a common offending allergen in cats.)
Please respond with further questions or concerns if you wish.