The inflammatory, exudative, often painful and pruritic diseases of the external ear canals that are lumped together under the name of otitis externa are among the commoner difficult therapeutic problems encountered by dermatologists and otologists. Formerly they were often erroneously referred to as fungous infections, but the careful microbiological studies of Syverton, Hess, and Krafchuk1 and others have shown that infections of the ear canals due to common dermatophytes are virtually nonexistent, except for a few cases of monilial infection. The primary eruption in otitis externa is usually a manifestation, localized in the ear canal, of such common dermatoses as seborrheic dermatitis, psoriasis, eczematous dermatitis, and atopic dermatitis.2 These skin diseases are often seen in the same patients in their more typical locations elsewhere on the head or body. The infectious micro-organisms that are found in some cases, especially in those with exudative manifestations, appear to be
Baer RL, Litt JZ. TREATMENT OF OTITIS EXTERNA WITH HYDROCORTISONE SUSPENSION. JAMA. 1954;155(11):973–974. doi:10.1001/jama.1954.73690290006006c
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