Crab lice

The two species that belong to this group include Pediculus humanus capitis (head louse) and P. humanus corporis (body louse). The eggs (or nits) remain firmly attached to the hair, and in about 10 days the lice hatch to form nymphs, which mature in 2 weeks. The lice become attached to the base of the hair follicle and feed on the blood of the host.10 Pubic or crab lice are found on the hairs around the genitals, but may occur... 

B. Chemical damage (chiggers), lice, crab lice... 

Head lice, crab lice Topical Apply about 30 ml of shampoo to dry hair and massage into hair for 4 min. Add small amounts of water to hair until lather forms, then rinse hair thoroughly and comb with a fine tooth comb to remove nits. Maximum 60 ml of shampoo. 

Baccharis multiflora, Baccharis spp. An infusion prepared from the leaves of B. multiflora, Baccharis spp. is said to be effective against catarrhs and was used for urinary problems in 19th century Mexico. Two unidentified species of this genus — quappatli and malinalli — are listed in the Florentine Codex as treatments for blotched face (applied internally) and for worms in the eyes and crab lice in the eyelids (especially applied externally), respectively. 

Carbaryl (carbaril) is another reversible carbamoy-lating anticholinesterase that closely resembles physostigmine in its actions. It is widely used as a garden insecticide and, clinically, to kill head and body lice. Sensitive insects lack cholinesterase-rich erythrocytes and succumb to the accumulation of acetylcholine in the synaptic jimctions of their nervous system. Effective and safe use in humans is possible because we possess cholinesterase, and absorption of carbaryl is very limited after topical application. The anticholinesterase malathion is effective against scabies, head and crab lice. 

Pubic or crab lice are found on the hairs aronnd the genitals, although they can occur in other areas of the body (e.g., eyelashes, beards, and axillae). Patients nsually complain of severe pruritus from papular lesions produced by the bite of the louse. Hypersensitivity to foreign material injected by the lice can produce macular swellings and occasionally can lead to secondary bacterial infections. ... 

Phthiriasis palpebrarum is an imcommon eyelid infestation by Phthiruspubis (crab louse) and, less commonly, by the Pediculus bumanus species, P. humanus var. capitis (head louse) and P humanus var. corporis (body louse). The term pediculosis refers to infestation by the two P humanus species and should not generally be used when referring to eyelid manifestations. 

The crab louse Phthirus pubis is another parasite of humans, which occurs in the coarser hair of the underarms and genital area. 

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