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A blood bruise is different from a regular bruise. A regular bruise results from some force striking the area. For example, I fell, hit my knee, and got a bruise. A blood bruise results from blood leaking out of a capillary because of pressure on the capillary. For example, sucking the skin, or what's called a hickie / hickey, brings blood to the skin surface. The blood makes every pore into a red dot. Squeezing a pimple or pinching can have the same result.

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