Blue skin

Blue skin may refer to:


 * Argyria, a condition caused by the ingestion of elemental silver, silver dust or silver compounds
 * Methemoglobinemia, the presence of excessive levels of methemoglobin in the blood
 * Cyanosis, a change of skin color due to decreased amounts of oxygenated hemoglobin
 * Blue baby syndrome, cyanosis in babies
 * Purpura, hemorrhagic lesions caused by bleeding underneath the skin
 * Bruise
 * Petechia