Why do my toenails get dusky sometimes? Cyanosis?

answered:

Circulation

Heart
have it checked out.could be a sign of heart changes
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Heart Toenails Blue skin

Poor circulation

Peripheral_cyanosis
A bluish color is consistent with poor circulation which should be evaluated with a Doppler to determine both arterial and venous circulation. This is part of comprehensive examination re blood pressure, sugar, lipids, heart evalution.
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Toenails Sugar Heart Blood pressure Blood Circulation Blue skin