Found it:Raynards Disease
Circulatory issues are frequently the culprit for color changes in your skin—flushed cheeks from fever or pale fingers from cold weather are but a few examples of ways in which our circulatory system can externally signal us to give our bodies some important attention.
Bluish discoloration of the hands, feet, or other extremities can occur from external causes such as extreme temperature or trauma that has resulted in bruising. Bluish discoloration that results from various internal phenomena is referred to as cyanosis. Aside from these external forces, there are several medical conditions that have cyanosis as a possible symptom including Raynaud’s Syndrome, blood clots, or shock. Raynaud’s syndrome is a circulatory issue that causes decreased blood supply to extremities such as the fingers and toes, causing them to appear discolored and cold. It can be triggered by cold temperatures, stress, or a connective tissue disorder such as systemic lupus. A blood clot in the body can obstruct the flow of blood to extremities such as hands or feet, causing discoloration due to the lack of oxygen in the tissues. Circulatory shock occurs when the body’s tissues have insufficient blood flow. It is accompanied by clammy skin, confusion, unconsciousness, and possible discoloration of the extremities.
If you cannot trace this symptom to an external cause such as cold temperatures or trauma that resulted in bruising, consult your medical provider as soon as possible, as blue hands can be a symptom of more serious underlying conditions.