Infestation by head lice (Pediculus capitis) occurs on hair, eyebrows and eyelashes; infestation by body lice (P. corporis) is of the clothing, especially along the seams of inner surfaces. Crab lice (Phthirus pubis) usually infest the pubic area, and—more rarely—facial hair (including eyelashes in heavy infestations), axillae, and body surfaces. Infestation may result in severe itching and excoriation of the scalp or body. Secondary infection may lead to regional lymphadenitis (especially cervical).