Symptoms of lice (lice)
The incubation period of pediculosis (lice) in case of infection with a mature individual is 6-12 days.
There are pediculosis of the trunk, head and pubic pediculosis (fthiracy).
The symptoms of pediculosis (lice) depend on the intensity of the infestation. With a small number of parasites and low sensitivity of the skin, the infected can not complain for a long time. The main subjective symptom of pediculosis is itching in the head, trunk or pubic area, depending on the type of parasite. At the head lice in the process of examination, identify impetiginous foci covered with yellow (honey) crust, folliculitis, areas of skin eczematics, especially in the nape, temples, behind-the-neck folds. Often find lymphadenitis. In neglected cases, the formation of a tangle is observed-tangled and stuck together with purulent exudate of hair. In the case of a pediculitis, skin areas that are in close contact with clothing are affected (they include the shoulders, upper back, axillary hollows, neck, rarely stomach, loin, thigh-groin area). In the places of bites of lice lice appear urtikarno-papular rashes followed by cyanosis, hyperpigmentation of the skin and frequent attachment of secondary pyodermia (ectema). In chronic pediculosis, the skin thickens, acquires a brown color (melanoderma), and is scaly. Notice the whitish scars after the pustular lesions, which complicated the calculus. These skin changes are referred to as "vagrancy disease". With fthiroid, an itch is insignificant. In the bite of the pubic lice, persistent grayish-bluish rounded or oval spots up to 1 cm in diameter appear (blue spots, maculae coeruleae).
The head louse (Pediculosis capitis) parasitizes the skin of the scalp and has a grayish color. The size of males is 2 mm, females 3 mm. The clinic and diagnostics at a pediculosis of a pilar part of a head does not represent special difficulties. Itching, scratching, impetigious cortex in the occipital region behind the auricles give reason to suspect pediculosis of the scalp.
Head lice settle on the skin of the scalp mainly in the occipital and temporal zones. Being bloodsucking insects, they cause typical manifestations of bites - inflammatory papules of a hemispherical shape. Bites cause severe itching, the patient excoriates papules, which are often complicated by pyogenic infection in the form of vulgar impetigo. Purulent crusts glue the hair into a single solid conglomerate, the occipital and cervical lymph nodes can grow. Therefore, if there is persistent itching of the scalp and detection of pyoderma in the temporo-occipital zone, lice should be excluded. With a thorough examination, you can find small whitish nits on the hair, mobile head lice are not always found. Detection of nits and especially lice confirms the diagnosis.
With a careful examination on the skin and hair can detect insects and nits grayish-white, glued with chitinic substance to the hair.
Lice of the body (Pediculosis corporis) is caused by a louse, which lives in the folds of clothing. The favorite places for skin lesions are the shoulders, upper back, abdomen, waist, inguinal-femoral region. The symptoms of lice (lice) are characterized by intense itching, multiple linear brushes. The development of the process is accompanied by the formation of a distinct brownish pigmentation and small scurvy peeling.
By contact with a sick person, louse-lice fall on the clothes and skin of people around them. Settled in the folds of clothing, lice bite the skin of the host adjacent to the clothes. The skin reaction to bites can be in the form of inflammatory spots and swollen gray-papules. The localization of bites coincides with the zones where the linen is in contact with the skin as much as possible (lower back, interscapular and axillary zones, skin of the neck, tibia). Bites cause intense itching which can result in combing and pyogenic complications in the form of streptococcal pyoderma. With prolonged existence of lice and chronic scratching, the skin is pigmented and licensed. Fat lice represents a major epidemiological danger, as these insects carry the causative agent of typhus.
Pubic lice (Pediculosis pubis) is caused by plaids that live on the pubic skin and border with it the area of the hips and abdomen. Sometimes insects spread to the skin of the chest, armpits, the eyebrows and eyelashes. At the site of insect bites, round pale blue or pale gray spots are formed that do not disappear when pressed. Pubic pediculosis is usually transmitted sexually, often accompanied by venereal diseases.
Infection often occurs during sexual contact. Pubic lice (ploschitsy) settle in the zones of body hair, mainly in the pubic region and perineum, less often in the armpits, on the chest. In advanced cases, lice are found on the eyebrows and eyelashes, where they glue their nits. In persons with severe hair embolism, larva lice can be on the entire skin.
Ploschitsy inactive, attached to the skin and the bases of the hair. "Sometimes in these places an inflammatory reaction develops in the form of small bladder spots (up to 1 cm) with a hemorrhagic shade of spots (the so-called lice maculae, or maculae coeruleae) that do not disappear with diascopy. In the case of lesions of eyelashes, there is swelling and inflammation of the eyelids (parasitic blepharitis).