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My little 8 month old Maltese dog has a bald spot on her right side, with some inflammation, what is this? - ringworm on a maltese dog pictures

Two weeks ago we noted that the right side was a bald spot and it seemed that something had bitten. The veterinarian has examined the lamp made of wood and cytology in the office and said he did not know that it braid and does not seem concerned, however, two weeks later, the hair and shoved it is some swelling and slight swelling. Has anyone had this happen, their dogs, before once again it is only 8 months.