Are you sure it was an injection? Because there is a treatment called Capsaicin, which is a component of hot red peppers used in a pain-relieving skin cream called Zostrix. Capsaicin seems to reduce a substance in the body, known as substance P, which contributes both to inflammation and the delivery of pain impulses from the central nervous system, according to our encyclopedia. A small amount of capsaicin must be applied to the area of inflammation about four times a day. Pain relief usually begins within 1 to 2 weeks.
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