High sugar level slows down the healing of skin related infections as neutrophils are vulnerable to it. Another reason is insufficient supply of oxygen due to the high blood glucose. The condition can get fatal.
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Excessive urination can cause dehydration to the point where your skin tissues begin to dry. Added to that is the poor blood circulation. Nerve damage could yet be another reason to give rise to this condition.
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Blurred vision can also be attributed to excessive urination. The drying effect happens all over the body, including the eyes. High blood glucose can lead to retinopathy and can also cause total blindness in the eyes.
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