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​Symptoms and Signs – Differential Diagnosis of Stomatitis, Dark Lesions (Brown, Blue, Black)
• Coated tongue: accumulation of keratin; harmless condition that can be treated by scraping
• Melanotic lesions: freckles, lentigines, lentigo, melanoma, Peutz- Jeghers syndrome, Addison’s disease
• Varices
• Kaposi’s sarcoma: red or purple macules that enlarge to form tumors; seen in patients with AIDS
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