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Dark urine
- ... acid is also excreted in urine, making the urine turn dark when exposed to air. More About This Health ...
- ... called acanthosis nigricans that is characterized by thick, dark, velvety skin in body folds and creases. The ... limb dwarfism (achondroplasia); profound developmental delay; and thick, dark, velvety skin. The genetic change that causes this ...