For this problem, there is only a short description of the lesions, it is not enough information to be sure of the treatment.
But I could still suggest these homeopathic products:
LACHESIS MUTUS 7CH and
both been given 3-4 times a day (3 pellets or 15 drops each time)
Dr.Paul Guindon DMV
Clinique veterinaire Salaberry
Medecine conventionnelle et holystique
1895 Salaberry, Montreal, QC