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It can be used to treat Raynaud's Disease
This is a condition that is sometimes inherited, which causes the fingers to become cold, white and/or blue and painful with relatively minor exposure to cold.
It is caused by hypersensitivity of the muscular wall of the arteries supplying the fingers, causing the circulation to be reduced in the fingers.
In severe cases, ulceration and frostbite can result.
Injection of Botox into the bases of the fingers can be very effective in improving circulation, lasting for 3-4 months or more.