'Collie Nose' problems may result from either one of two causes and don't just target Collies! The first cause is known as Discoid Lupus Erythematosus, which is an autoimmune disease that can eventually lead to squamous cell carcinoma if untreated. The second cause, Nasal Solar Dermatitis, is a lack of pigment at birth that can then lead to a gradual ulceration of the nose cells.
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