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TREATMENT
Management options in impetigo include the following:
1. No treatment, waiting for natural resolution, hygienic measures
2. Topical antiseptics, such as saline, hexachlorophene, povidone-iodine and chlorhexidine.
3. Topical antibiotics, such as neomycin, bacitracin, polymyxin B, gentamycin, fusidic acid, mupirocin or topical steroid/antibiotic combination
4. Systemic antibiotics, such as penicillin, (flu)cloxacillin, amoxicillin/clavulanic acid, erythromycin, cephalexin
The aims of treatment include resolving the soreness caused by lesions, the unsightly appearance of lesions on 'high expression areas' such as the face, and prevention of spread to other people. An ideal treatment should be effective, cheap, easy to use and accepted by patients. It should be free from side-effects, and should not contribute to bacterial resistance. For this reason antibiotics should not have an unnecessarily broad spectrum (Smeenk 1999; Espersen 1998) and the local antibiotic used should preferably not be one which may be needed for systemic use (Smeenk 1999; Carruthers 1988).
Expecting a natural resolution could be acceptable if the natural history were known and benign. Impetigo is considered to be self limiting by many authors (Hay 1998; Resnick 2000). However, data on the true natural history of impetigo are absent. Reported cure rates of placebo creams vary from 8% to 42% at 7-10 days (Ruby 1973; Eells 1986). Topical cleansing used to be advised 30 years ago as an alternative for antibiotic treatment, but is said to be no more effective than placebo (Dagan 1992). Guidelines and treatment advice often do not mention this possibility as, frequently, the main concern is preventing the spread of the infection to other children.
A choice has to be made between topical and systemic antibiotic treatment although sometimes dual therapy is employed. An advantage of the use of topical antibiotics is that the drug can be applied where it is needed, avoiding side effects like gastro-intestinal upsets. Also, compliance seems to be better (Britton 1990).
The disadvantages of using topical antibiotics include the risks of developing bacterial resistance and of sensitization i.e. an allergic contact dermatitis to one of the constituents of the topical preparation (Smeenk 1999; Carruthers 1988). This is especially common with the older antibiotics such as gentamycin, bacitracin and neomycin (Smeenk 1999). Some preparations (e.g. tetracycline) can cause staining of skin and clothes.
Staphylococcal resistance against penicillin and erythromycin is common (Dagan 1992). Bacterial resistance against the newer antibiotics, such as mupirocin ointment and fusidic acid ointment, is still limited (de Neeling 1998). Another advantage of the newer antibiotics is that mupirocin is never, and fusidic acid not often, used systemically.
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