system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Raynauds phenomenon is commonly seen in
assistant
The correct answer is  . It is an episodic vasospasam,especially aeriolar spasam usually bilateral more often seen in upperlimb of females as a result of abnormal sensitivity to cold.Patient develops blanching,cyanosis qnd later flushing .usually medial four digits and palm are involved.Thumb is spared.If vasospasam becomes longer,gangrene or ischemic ulceration supervenes along the tips of fingers. Refer page no 183 of SRB's manual of surgery5th edition.