This can occur as early as 1 month after stopping treatment or after 3 to 5 years. (vet.utk.edu)
When people experience such symptoms they often make the mistake of stopping their treatment program, then waiting until the skin gets «better» before beginning again. (marieveronique.com)
Please consult your primary care veterinarian regarding other medications your pet is taking if you are unsure whether or not to stop the treatment before the appointment. (pvs-ec.com)