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Scabies

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Scabies

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GENERAL

Scabies

Scabies is caused by a tiny mite that has infested humans for at least 2,500 years. It is often hard to detect, and causes a fiercely, itchy skin condition. Dermatologists estimate that more than 300 million cases of scabies occur worldwide every year. The condition can strike anyone of any race or age, regardless of personal hygiene. The good news is that with better detection methods and treatments, scabies does not need to cause more than temporary distress.

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Scabies FAQ

The human eye can barely see the microscopic mite that causes scabies. Being a tiny, eight-legged creature with a round body, the mite burrows in the skin. Within several weeks, the patient develops an allergic reaction causing severe itching; often intense enough to keep sufferers awake all night.

Human scabies is almost always caught from another person by close contact. It could be a child, a friend, or another family member. Everyone is susceptible. Scabies is not a condition only of low-income families and neglected children, although, it is more often seen in crowded living conditions with poor hygiene.

Attracted to warmth and odor, the female mite burrows into the skin, lays eggs, and produces toxins that cause allergic reactions. Larvae, or newly hatched mites, travel to the skin surface, lying in shallow pockets where they will develop into adult mites. If the mite is scratched off the skin, it can live in bedding for up to 24 hours or more. It may take up to a month before a person will notice the itching, especially in people with good hygiene and who bathe regularly.

The earliest and most common symptom of scabies is itching, especially at night. Little red bumps like hives, tiny bites, or pimples appear. In more advanced cases, the skin may be crusty or scaly.

Scabies prefers warmer sites on the skin such as skin folds, where clothing is tight, between the fingers or under the nails, on the elbows or wrists, the buttocks or belt line, around the nipples, and on the penis. Mites also tend to hide in, or on, bracelets and watchbands, or the skin under rings. In children, the infestation may involve the entire body including the palms, soles, and scalp. The child may be tired and irritable because of loss of sleep from itching or scratching all night.

Bacterial infection may occur due to scratching. In many cases, children are treated because of infected skin lesions rather than for the scabies itself. Although treatment of bacterial infections may provide relief, recurrence is almost certain if the scabies infection itself is not treated.

Crusted scabies s a form of the disease in which the symptoms are far more severe. Large areas of the body, like the hands and feet, may be scaly and crusted. These crusts hide thousands of live mites and their eggs, making treatment difficult because medications applied directly to the skin may not be able to penetrate the thickened skin. This type of scabies occurs mostly among the elderly, in some AIDS patients, or in people whose immunity is decreased and is extremely infectious.

Your dermatologist will do a thorough head-to-toe examination in good lighting, with careful attention to the skin crevices.

Many cases of scabies can be diagnosed without special tests by your dermatologist. To confirm scabies, your dermatologist can perform a painless test that involves applying a drop of oil to the suspected lesion. The site is then scraped and transferred to a glass slide, which is examined under a microscope. A diagnosis is made by finding scabies mites or their eggs.

Scabies is most common in those who have close physical contact with others, particularly children, mother of young children, sexually active young adults and elderly people in nursing homes.

Scabies among resident patients of nursing homes and extended care facilities has become a common problem due to delayed diagnosis since it can be mistaken for other skin conditions. The delay allows time for scabies to spread to nursing home staff and other residents. Because residents require assistance in daily living activities, this exposure provides an opportunity for the scabies to spread.

  • 5% permethrin cream is applied to the skin from the neck down at bedtime and washed off the next morning. Dermatologists recommend that the cream be applied to cool, dry skin over the entire body (including the palms of the hands, under fingernails, on the soles of the feet and on the groin) and left on for 8 to 14 hours. A second treatment one week later may be recommended. Side effect of 5% permethrin cream includes mild temporary burning and stinging. Lesions heal within four weeks after the treatment. If a patient continues to have trouble, reinfestation may be a problem requiring further evaluation by the dermatologist.
  • Ivermectin is an oral medicine that may be prescribed for the difficult-to-treat crusted form. It is not to be used in infants or pregnant women.
  • Antihistamines may be prescribed to relieve itching, which can last for weeks, even after the mite is gone.
  • Getting rid of the mites is critical in the treatment of scabies. Everyone in the family or group, whether itching or not, should be treated at the same time to stop the spread of scabies. This includes close friends, daycare or school classmates or nursing homes.
  • Bedding and clothing must be washed or drycleaned.

Successful eradication of this infestation requires the following:

  • See a dermatologist as soon as possible to begin treatment. Remember, although you may be disturbed at the thought of bugs, scabies is no reflection on your personal cleanliness.
  • Treat all exposed individuals whether obviously infested or not. Incubation time is 6-8 weeks so symptoms may not show up for a while. If you do not treat everyone, it is as if you were never treated.
  • Apply treatment to all skin from neck to legs, including between the toes, the crease between the buttocks, etc. If you wash your hands after application, you need to reapply the medication to your hands again.
  • Wash clothes. Do all the laundry with the hottest water possible. The mite is attracted to scent. Any clean clothes hanging in the closet or folded in the drawers are OK.
  • Items you do not wish to wash may be placed in the dryer on the hot cycle for 30 minutes, or pressed with a warm iron.
  • Items may be dry-cleaned.
  • Change the bedding.
  • Carpets or upholstery should be vacuumed through the heavy traffic areas. Vacuum the entire house and discard the bag, just to be on the safe side.
  • Pets do not need to be treated.
  • Items may also be placed in a sealed plastic bag and placed in the garage for two weeks. If the mites do not get a meal within one week, they die.
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