Human mange, or scabies, begins as a raised, red, pimply rash that looks similar to acne or mosquito bites, explains WebMD. What sets it apart from most other rashes is severe, constant itching. Short, flesh-colored tracks under the skin often accompany the rash.
Scabies is an infestation of Sarcoptes scabiei, a tiny mite that is almost invisible to the naked eye, although some people with scabies notice tiny black dots on the surface of the skin, states WebMD. The mites can live anywhere on the body, but they most often invade the areas between the fingers, the folds of the wrists and elbows, and around the waistline, breasts and genitals. In infants, they sometimes live on the head and neck or on the palms of the hands or the soles of the feet.
The rash usually develops about four to six weeks after initial exposure and becomes progressively more severe, notes WebMD. Some people develop scales or blisters or open sores due to constant scratching. In very severe cases, a scaly, yellowish crust of mites and eggs is visible on the skin.