As a medical professional with expertise in dermatology, I can explain that there are several reasons why a person's skin might appear blue. The most common cause is a condition known as cyanosis, which is a result of low oxygen levels in the blood. This can occur due to various health issues, such as heart disease, lung disease, or anemia. Other causes can include exposure to cold temperatures, certain medications, or genetic conditions that affect the skin's pigmentation. It's important to note that blue skin is not a normal condition and should be evaluated by a healthcare provider.

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Argyria or argyrosis is a condition caused by excessive exposure to chemical compounds of the element silver, or to silver dust. The most dramatic symptom of argyria is that the skin turns purple or purple-grey. It may take the form of generalized argyria or local argyria.read more >>