Carpal tunnel is due to nerve compression, so this is unlikely to cause the bluish tinge. The discoloration could be due to an allergen. It could also be due to circulatory problems, temperature problems or a rash. You will need to see if any allergens are triggering this reaction. You may also need to notice if ‘cold’ is precipitating your symptoms. You will need to consult your primary care physician for proper assessment.
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