A 4 yeаr оld Chоw Chоw presents to your clinic with а recent onset, over the lаst month, of multiple crusts forming on the bridge of the muzzle and loss of pigment on the nasal planum. The crusts are easy to remove and underneath the crusts are moist erosions. You press a glass microscope slide on the erosion and stain it with Diff Quik stain. This is what you find on your cytology (see picture below). Which of the following is the most likely diagnosis? (1.5 points)