cyanotic hands or peripheral cyanosis or blue hands at asian old woman with congenital heart disease

acquired blue bluish breathless breathlessness cardiac central changes chronic color congenital covid cyan cyanosis cyanotic dark discoloration discolored discolouration discoloured disease disorder drug finger fingers hand hands healthy heart hypoxemia hypoxia ill illness induced lung pale pallor palm palmar patient perioral peripheral problem purple respiratory skin smoker smoking stain unhealthy