What is your diagnosis?

History The patient was presented to the Small Animal Teaching Hospital, Chulalongkorn University with the chief complaints of dyspnea and sneezing for a few weeks. The dog had been diagnosed twice and treated for blood parasitic infection. Clinical examination General clinical conditions, which were hydration status, mucus membrane color, heart sound and lung sound, were normal. However, the subcutaneous swelling above the left nasal bone could be detected. The swelling was soft in consistency on palpation. Laboratory data, including complete blood count and serum biochemistry were within normal limits.