The presence of pubic lice is heralded by moderate to severe itching in the area covered by pubic hair. This itch is frequently worse at night. Because the crab louse requires human blood to survive, it buries its head inside a pubic hair follicle. It excretes a substance into the skin that causes the itching.
Sometimes the bite can cause an inflammatory skin reaction that is bluish gray in color. Although the lice do not cause a rash, the constant scratching and digging can cause the skin to become raw, and secondary infections may develop.
...I don't have these describing problems....bastards