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Dirt and germs frequently have been rubbed into this type of wound, which is why it is important to clean and irrigate an abrasion thoroughly with soap and water to prevent infection. Other terms for an abrasion include a scrape, a rug burn, a road rash, or a strawberry.
A third-degree laceration is a tear in the vaginal tissue, perineal skin, and perineal muscles that extends into the anal sphincter (the muscle that surrounds your anus). A fourth-degree tear goes through the anal sphincter and the tissue underneath it. It's also possible to tear in other places.