Answer:
Capillaries are composed of a single layer of cells and are the sites of fluid and gas exchange. The single cell later of capillaries, although ideal for diffusion, creates problems because capillary beds are easily destroyed. High blood pressure of any impact can rupture the thin-layered capillary and bruising occurs when blood rushes into the space between tissues. White blood cells eat the nutrients from the broken capillary tissue and recycle it basically. There is no way to get rid of them once they are broken, bruising will occur and it takes time before new capillaries can replace the old, the blood will be soaked up, and the bruising disappears.
Therefore the only way to deal with broken capillaries is to wait for them to disappear on their own.