Raynaud's phenomenon is characterized by fingers becoming white due to lack of blood flow, then blue due to oxygen consumption, and finally red as blood flow returns.

The symptoms involved in CREST syndrome are associated with the generalized form of the disease Systemic sclerosis (scleroderma). CREST is an acronym for the clinical features that are seen in a patient with this disease. The “C” stands for calcinosis, where calcium deposits form under the skin on the fingers or other areas of the body. The “R”, stands for Raynaud's phenomenon, spasm of blood vessels in the fingers or toes in response to cold or stress. The “E” represents esophageal dysmotility, which can cause difficulty in swallowing. The “S” is for sclerodactyly, tightening of the skin causing the fingers to bend. Finally, the letter “T” is for telangiectasia, dilated vessels on the skin of the fingers, face, or inside of the mouth. 

Usually only 2 of the five symptoms of the CREST syndrome is necessary to be diagnosed with the disease.

The most classic symptom of scleroderma is a type of skin tightening called sclerodactyly. The initial stages of the disease involves swelling of the fingers. Later, as the connective tissue becomes fibrotic, skin on the fingers and toes becomes hard and shiny. The fingers can become difficult to bend and can form contractures due to the severe tightening of the skin.

Telangiectasia is the dilation of small superficial vessels and capillaries that cause numerous flat red marks on the hands, face and tongue. Telangiectasia can be a symptom of scleroderma or other systemic diseases.