Liz Buchanan BVSc MRCVS
Hello - I am a vet but I'm afraid that I'm going to disappoint you, because until I know what is causing that clinical sign in your particular dog, it is impossible to know whether it is going to be treatable. The vet, who has presumably examined the patient - and by the sounds of it, carried out at least one test - will probably know more than me regarding which differentials (possibilities) they are now most concerned about. If that vet isn't his current vet, then your current vet may be able to ask for the clinical history, which would clear up any doubt as to when the condition started. Once they have examined the dog, it would be a good idea to ask what's on their differentials list. There is some wriggle-room in your question regarding what you mean by 'cured' because the condition could turn out to be a chronic one, which might be 'managed' rather than cured. Differentials that spring to my mind from a photo alone include cancers, endocrine (hormonal) diseases, lupus (because I dont know whether or not enough has been done, to rule it out), or other autoimmune disease. I'm sure that your vet wouldn't leave it there - bloods or a biopsy, for example, may give more information. I think that this is well worth looking into.