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Hi this is Dr. Hill. Has Simba been scratching at that area? Can you post a picture?
that's okay. With hamsters that develop pigmented lesions on their skin there are a few possibilities: Cushing's ds, comedones (black heads, ), demodex, or neoplasia. It would be ideal to take Simba to your local veterinarian to have a skin scrape and to discuss a possible biopsy or needle aspirate.