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Skin Infection
Parasite Infestation
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Early sign - Tiny grey irregular tracks
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Burrows
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Rash - Multiple well demarcated
papules
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Multiple well defined pustules with
erythema base on the wrist
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Affected web-space
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Multiple well defined nodules
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Scabies
acquired by skin-to-skin contact with someone else withscabies.
Scabies is not due to poor hygiene. Nor is it due to animalmites, which do not infest humans. However animal mites
can be responsible for bites on exposed sites, usually theforearms.
Typically, an affected host is infested by about 10 -12 adultmites. After mating, the male dies.
The female scabies mite burrows into the outside layers of
the skin where she lays up to 3 eggs each day for herlifetime of one to two months. The development from eggto adult scabies mite requires 10 to 14 days.
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Signs and symptoms
Itch
characteristically more severe at night and affects the trunk and limbs.
BurrowsScabies burrows appear as tiny grey irregular tracks between the fingersand on the wrists, armpits, buttocks, on the penis, insteps and backs of
the heels. Generalised rash
Scabies rash appears as tiny red intensely itchy bumps on the limbs andtrunk. It can easily be confused with dermatitis or hives
NodulesItchy lumps or nodules in the armpits and groins or along the shaft of thepenis are very suggestive of scabies.
AcropustulosisBlisters and pustules on the palms and soles are characteristic of scabies ininfants.
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Secondaryinfection
Impetigo commonly complicates scabies and
results in crusting patches and scratched
pustules.
Cellulitis may also occur, resulting in localised
painful swelling and redness, associated with
fever.
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Treatment
Scabicides are chemical insecticides used to treat
scabies 25% Benzyl benzoate lotion, applied daily for 3 days
5% Permethrin cream, left on for 8-10 hours0.5% Aqueous malathion lotion, left on for 24 hours
scabicide has to be applied before bed to the
whole body from the chin to soles
Repeat treatment a week later is recommended Should not repeated for several weeks, will cause
skin irritation
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Crusted scabies
very contagious
but very little itch
The patient presents with a generalised scaly rash
It is frequently misdiagnosed as psoriasis
Unlike the usual form of scabies, it affects scalp
most likely to affect individuals with a poor
immune system, neurological diseases, theelderly or those with mental incompetence
must be treated with insecticides
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