Rodent Ulcer in animals [cat, dog] is an eosinophilic autoimmune lesion.   I treat it with an oral preparation that supplies Cytokines and micro RNA that eliminate autoimmune responses.   If present a long while, it takes a few weeks to disappear.  If a fresh lesion sometimes only a few days are required to observe a favorable response.  Keep in mind it is not the product that eliminates the autoimmunity, but the immune system prompted by the product.   If one would like more info,  write me privately.  I have lots of data available.    Regards,  Mac