Lice (pediculosis capitis)
Lice (pediculosis capitis) can cause intense itching, which can result in scratching and areas of bloody skin crusts.
Head lice (pediculosis capitis) are a common, highly contagious infection that often occurs in nurseries, day care centers, and schools. It is caused by infestation with the human head louse, Pediculus human’s capitis, and it is usually very itchy.
Lice are very small insects that feed on human blood. The female louse attaches her eggs (nits) to the base of the hair near the scalp, and the nits hatch 7–10 days later.