pubic lice
Introduction
Introduction to pubic disease Rickets are skin diseases caused by lice, which occur all over the world. The haze is a type of rickets that can be transmitted through sexual contact, often shared by couples, and more common in women. Popular in the United States and Western Europe in recent years. basic knowledge The proportion of sickness: 0.8% Susceptible people: no special people Mode of transmission: sexually transmitted contact Complications: impetigo folliculitis
Cause
Cause of pubic lice
Infection (35%):
Depending on its shape and parasitic location, it can be divided into head louse, body louse or clothes louse, and pubic louse, which are parasitic on human hair, underwear. And pubic hair, both absorb human blood and live, while releasing toxic saliva, sputum and venom can cause pruritic dermatitis, sputum infection returns to heat, epidemic typhus and war stagnation, haze usually does not spread infectious diseases However, individual reports have the possibility of contracting typhus in certain circumstances.
The pubic lice are wider and shorter than the human head and the human body. The female body is 1.5×2.0mm long and the male body is 0.8×1.2mm long. There are three pairs of feet, the forefoot is slender, and the other two pairs have hook-shaped giant claws. There is no obvious boundary, the abdomen is short and wide, and it is slightly like a crab. It usually holds the pubic hair and anal hair with giant claws, but spreads to the mane, eyebrows or eyelashes are rare.
Living environment (25%):
Usually grab the nearby hair and use the mouthparts to suck blood, but also climb on the skin like grayish yellow granules, generally limited to pubic hair or lower abdomen, licking eggs on the pubic hair, rust or reddish granules, sometimes Spotted bloody sputum, easy to identify with white head lice eggs.
The yin is afraid of light and yin, and can move around day and night. When the temperature is too high or too low, it is still, female and male adults, fertilize within 24 hours after mating, the female begins to lay eggs, and the haze spawns less. And small, 24-48 hours before his death, about 3 eggs per day, about 50 eggs, the adult life time is about 30 days, from the host within 24 hours of death, sputum is incomplete metamorphosis, life history In the third stage of egg, nymph and adult, the whole life cycle is completed in the host. When the female lays eggs, the glue is secreted, so that the eggs are firmly adhered to the hair or fabric fibers.
Prevention
Haze prevention
(1) Control of the source of infection: If the patient with pubic lice is found to be in need of timely treatment, the source of the infection should be traced, especially for his or her sexual partner, which should be examined and treated. Clothing, bedding and contaminants used on patients should be boiled or ironed. If one of the spouses is infected, it will usually be transmitted to another person. After the illness, the husband and wife will be treated at the same time. It is necessary to check for the presence of other sexually transmitted diseases at the same time for simultaneous treatment.
(2) cut off the route of transmission: prevention of pubic lice is first of all to eliminate prostitution and sexual disorder, but also to do a good job of personal hygiene, first of all to avoid unclean sexual intercourse. Because the main route of transmission of this disease is caused by unclean sexual intercourse. When traveling on business, do not use public bath towels, do not wear underwear, and do not share bedding with others. Pay attention to hygiene and bathe.
Complication
Complications of yin Complications, impetigo folliculitis
Often caused by scratching bloody or secondary impetigo, folliculitis and other infections, often scratches, blood stasis, or secondary bacterial infections such as impetigo and folliculitis, occasionally visible gray cyan or Light blue spotted rash.
Symptom
Symptoms of pubic lice common symptoms pruritus bacterial infection papular rash bloody pustules
The pubic lice live in the genitals and perineal hairs, with a certain degree of migration, itching in the pubic hair and its vicinity, scratching, scratching, blood stasis or secondary impetigo, folliculitis and other infections, sometimes seen in the bite Or large nails on the nails, that is, small gray pigmented spots, generally no more than 1cm in diameter. This kind of spot may be an allergic reaction of the skin to the sputum, and some people think that the saliva enters the blood when the blood is sucked by the sputum. Hemoglobin is discolored, and there is a slight bleeding at the bite. This place becomes a bluish spot. After killing the yin, the bleu can continue to exist for several days. The sputum can be found in the hair follicle, and the rust-colored eggs can be found in the hair shaft.
The main site of the disease is in the pubic hair area and the perianal area. It can also be found in the pubic hair and chest area. The common symptoms are severe itching. After scratching, it often causes scratches, blood stasis, or bacteria such as impetigo and folliculitis. Infection, occasionally visible gray cyan or light blue rash, its diameter is about 0.5cm, does not fade after acupressure, without itching, common in the medial side, lower abdomen and waist, this is because the vagina enters the bloodstream when the blood is sucking This causes the hemoglobin to be denatured, and after killing the haze, the cyan stain can persist for several months.
Examine
Examination of pubic lice
The disease usually does not require laboratory tests, and if necessary, the adult or insect eggs can be identified under a microscope or a magnifying glass.
Adults or eggs of the haze are found under a microscope or a magnifying glass.
Specimen collection: Cut the pubic hair with yin and eggs with scissors.
Specimen fixation: Select the following fixative: 70% alcohol or 5%-10% formalin solution, place the fixed specimen on the slide, drop a drop of 10% potassium hydroxide solution, put it on the alcohol lamp and heat it slightly. , microscope observation.
Results: The haze is crab-shaped, with 3 pairs of feet, the forefoot is small, the middle hind foot is huge, and the thick claws can catch the pubic hair. The eggs are rust or reddish.
Diagnosis
Diagnostic diagnosis of pubic lice
According to the history of sexual contact or other infections, itching in the pubic hair area, the lesions are mainly scratches, blood stasis, secondary impetigo, folliculitis or gray cyan or light blue spots can make a diagnosis. Diagnosis can be confirmed by looking at the pubic or pubic hair in the pubic skin or pubic area.
Diagnose based on:
1. The patient usually complains of genital itching and occasionally complains about other parts, such as itching of the eyebrows.
2. Physical examination revealed that there were vaginal or worm eggs in the above-mentioned parts, and inflammatory papules such as blood stasis, scratches, blemishes and folliculitis were observed.
3. Obvious adult or insect eggs are found under a microscope or a magnifying glass.
Differential diagnosis
The pubic lice disease should be differentiated from acne, genital skin pruritus.
1. The main differences between acne are shown in Table 1.
2. There is no primary damage to the genital skin pruritus, no blue spots, no vaginal and sputum egg vaginal disease can often be complicated with other sexually transmitted diseases, such as gonorrhea and syphilis.
Need to be differentiated from a variety of diseases, such as body phlegm, hemorrhoids, impetigo, seborrheic dermatitis, genital pruritus and contact dermatitis.
