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Scabies

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Scabies

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Scabies

  1. 1. SCABIES  By- Dr. Armaan Singh
  2. 2. Scabies  also known colloquially as the seven-year itch, is a contagious skin infection caused by the mite Sarcoptes scabiei. The mite is a tiny, and usually not directly visible, parasite which burrows under the host's skin, which in most people causes an intense itching sensation caused by an allergic response. The infection in animals other than humans is caused by a different but related mite species, and is calledsarcoptic mange.
  3. 3. • Overcrowding.,Poverty, poor nutritional status.,Homelessness.,Poor hygiene. • Institutions. Residential care homes in the UK, refugee camps in some parts of the world. • Dementia.,Sexual contact.,Children, especially in developing countries. • Immune suppression (eg, HIV infection). Like the elderly, immunocompromised individuals are at particular risk of the crusted variant. They tend to present with clinically atypical lesions and are often misdiagnosed, causing a delay in appropriate treatment and increased risk of a local epidemic. • The characteristic symptoms of a scabies infection include intense itching and superficial burrows. The burrow tracks are often linear, to the point that a neat "line" of four or more closely placed and equally developed mosquito-like "bites" is almost diagnostic of the disease RISK FACTORS
  4. 4. • Misdiagnosis is common and other skin disorders, particularly those causing itching, should be considered, including: Insect bites, Pubic lice and body lice, Atopic eczema, Tinea, Folliculitis, Impetigo, Contact dermatitis • Lichen planus. • Dermatitis herpetiformis. • Systemic lupus erythematosus • Bullous pemphigoid • Urticaria pigmentosa • Seborrhoeic dermatitis • Psoriasis,Prurigo nodularis DIFFERENTIAL DIAGNOSIS
  5. 5. • The diagnosis is largely clinical. A magnifying lens may help in identification of burrows or even occasionally mites.--The ink burrow test can be helpful in confirming burrows. Ink is rubbed over a burrow (for example, with the surface of a fountain pen nib) then wiped off with an alcohol swab. Ink will track into a burrow, outlining it.-- The diagnosis can be confirmed by taking a skin scraping from an affected area, placing the material on a glass slide with a drop of 10% potassium hydroxide and seeing an adult mite, egg or eggshell under light microscopy.-- Whilst the sensitivity of skin scrapings is low, it is very specific and a mite or eggs seen under the microscope will remove any doubt. INVESTIGATIONS
  6. 6. • The diagnosis is largely clinical. A magnifying lens may help in identification of burrows or even occasionally mites.--The ink burrow test can be helpful in confirming burrows. Ink is rubbed over a burrow (for example, with the surface of a fountain pen nib) then wiped off with an alcohol swab. Ink will track into a burrow, outlining it.-- The diagnosis can be confirmed by taking a skin scraping from an affected area, placing the material on a glass slide with a drop of 10% potassium hydroxide and seeing an adult mite, egg or eggshell under light microscopy.-- Whilst the sensitivity of skin scrapings is low, it is very specific and a mite or eggs seen under the microscope will remove any doubt. INVESTIGATIONS

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