Tinea Corporis or Tinea Circinata (Body Ringworm)

ESSENTIALS OF DIAGNOSIS

Ring-shaped lesions with an advancing scaly border and central clearing or scaly patches with a distinct border.
On exposed skin surfaces or the trunk.
Microscopic examination of scrapings or culture confirms the diagnosis.
General Considerations
The lesions are often on exposed areas of the body such as the face and arms. A history of exposure to an infected cat may occasionally be obtained, usually indicating microsporum infection. All species of dermatophytes may cause this disease, but Trichophyton rubrum is the most common pathogen, usually representing extension onto the trunk or extremities of tinea cruris, pedis, or manuum.
Clinical Findings
SYMPTOMS AND SIGNS
Itching may be present. In classic lesions, rings of erythema have an advancing scaly border and central clearing, occasionally with hyperpigmentation.
LABORATORY FINDINGS
Hyphae can be demonstrated by removing scale and examining it microscopically using KOH. The diagnosis may be confirmed by culture.
Differential Diagnosis
Positive fungal studies distinguish tinea corporis from other skin lesions with annular configuration, such as the annular lesions of psoriasis, lupus erythematosus, syphilis, granuloma annulare, and pityriasis rosea. Psoriasis has typical lesions on elbows, knees, scalp, and nails. Secondary syphilis is often manifested by characteristic palmar, plantar, and mucous membrane lesions. Tinea corporis rarely has the large number of lesions seen in pityriasis rosea. Granuloma annulare lacks scales.
Complications
Complications include extension of the disease down the hair follicles (in which case it becomes

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