<unk>  refer to a persistent blue or cyanotic discoloration of the digits, most commonly occurring in the hands although also occurring in the face and feet as well. The blue color is typically associated with poor oxygenation such as in asthma or emphysema
Acrocyanosis
Clubbing
Xerosis
Cyanosis
Cyanosis  
Retinopathy
Ectopia lentis
Polycythemia