Ringworm

Introduction The auricles begin to be red papules and blisters. Then desquamation and gradually spread to a large area of erythema, covering the scales. Clear edges with pimples or blisters. Can extend to the external auditory canal, the whole ear, the neck and face. Patients have a history of topical topical corticosteroids. Consciously itching is obvious, often on one side. Can be accompanied by hand and foot sputum, body sputum, head lice and so on. Scraping scales plus 10% KOH solution for direct microscopic examination showed branch-separated hyphae. Cultured with dermatophytes. Ear canal eczema, psoriasis, seborrheic dermatitis and other local moist, external ear canal damage such as ear and long-term topical use of antibiotics and corticosteroids are important predisposing factors.

Cause

(1) Causes of the disease

Otozoosis is a common disease, accounting for 15% to 20% of ear infections. It occurs mostly in tropical and subtropical warm and humid areas. It can be reached at any age, but it is most common in 20 to 40 years old. It is common on one side and on the right side, which may be related to the right hand to dig easily. Good summer. The fungi that cause auricle infection are mainly dermatophytes such as Trichophyton rubrum, Trichophyton rubrum, and Microsporum. It is caused by direct spread of head and face sputum or direct or indirect contact with hand, foot, sputum, armor, etc. This type of infection is also called deafness.

Most of the pathogens causing infection of the external auditory canal are Aspergillus fumigatus and Aspergillus niger. Among them, Aspergillus niger accounts for more than 90%. Others include Candida, Kenshin, Absidia, Acremonium, Brassica, Rhizopus, and Codon, etc., mostly from the fall of aerial spores. 80% to 90% of otitis externa can be found in various bacteria such as Pseudomonas, Proteus, Micrococci, Streptococcus, Escherichia coli, and Corynebacterium, when coexisting with fungi. Can increase fungal infections.

Localized skin lesions such as external ear canal eczema, psoriasis, seborrheic dermatitis, and local moist, external ear canal damage such as ear and long-term topical use of antibiotics and corticosteroids are important predisposing factors.

(two) pathogenesis

The fungi that cause auricle infection are mainly dermatophytes such as Trichophyton rubrum, Trichophyton rubrum, and Microsporum. It is caused by direct spread of head and face sputum or direct or indirect contact with hand, foot, sputum, armor, etc. This type of infection is also called deafness. Most of the pathogens causing infection of the external auditory canal are Aspergillus fumigatus and Aspergillus niger. Among them, Aspergillus niger accounts for more than 90%.

an examination

Related inspection

Ear, nose, throat swab bacterial culture Otolaryngology CT examination

The auricles begin to be red papules and blisters. Then desquamation and gradually spread to a large area of erythema, covering the scales. Clear edges with pimples or blisters. Can extend to the external auditory canal, the whole ear, the neck and face. Patients have a history of topical topical corticosteroids. Consciously itching is obvious, often on one side. Can be accompanied by hand and foot sputum, body sputum, head lice and so on.

There is a small amount of empyema in the ear canal, which can be directly inspected and cultured, and bacteria grow. Helps diagnose. Check the visible hyphae and spores by taking sputum or bracts and adding 10% KOH solution. Conidia heads are sometimes visible. Cultured with fungal growth.

Differential diagnosis

External ear canal mycosis should be differentiated from bacterial external auditory canal. The latter is generally acute, red, swollen and hot, especially earache. Chronic otitis externa is consciously itching, a small amount of empyema in the ear canal, direct examination and culture of bacterial growth.

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