Definition : This is one type of allergic dermatitis of the external auditory canal of the ear. Clinical Features : Irritation and oedema of the canal may occur. Weeping eczema with crusting occurs in chronic cases. Secondary infection may lead to acute otitis externa . Stenosis gradually occurs, due to oedema and fibrosis. Fissuring and scaling of the external canal at the entrance is the result of a chronic allergy. Treatment : 1. Acute stage : Steroids applied locally are very helpful. Antibiotics are administered locally and systemically. Antihistamines are prescribed. 2. Chronic stage : The steroid with antibiotics is very helpful. 10 % of silver nitrate is applied to fissures. Dilatation of stenosis by indwelling polyethene tubes or plastic surgery may be required.
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