Raynaud's phenomenon is a disorder in which blood vessels contract to delay the blood flow. Since the blood flow is obstructed, the skin seems reddish black due to blood clots. This illness causes insensibility in body parts like fingers, nipples, toes and areola. The body parts can become white, red or black due to blood loss and at later stages ; there could be a bluish tinge. The phenomenon is said to happen of unknown reasons. However, research has demonstrated that emotional stress can be one of the explanations for skin discoloration. Emotional imbalance can cause first Raynaud's illness symptoms. Viagra is a common drug that is used to cure sexual impotence in men and it's been used for other purpose too.
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