Acute otitis externa is the acute inflammation of the external auditory canal. It may be generalised or localised. The localised variety presents as a furuncle in the ear. The generalized type may be infiltrative with thickening of tissues or it may be desquamative. Aetiology : It occurs at any age. Water entering the ear may carry with it organisms which may cause acute otitis externa. Damp climate may also cause it. Scratching the ear causes abrasions which may get infected. Discharge from the middle ear may cause a secondary infection of the external auditory canal. Diabetes may cause severe otitis externa which is very painful and also leads to paralysis. Pathology : A furuncle is usually a staphylococcal infection affecting a hair follicle or a sebaceous gland. Generalized otitis externa is the result of staphylococcal, streptococcal or gram-negative bacillary infection. Symptoms : Pain in the presenting symptom which may be severe as the skin is
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