Dermatophytosis (Tinea)
Differential diagnosis
Other annular rashes are often confused with tinea infections. Eczema and psoriasis are commonly confused with tinea. Pityriasis versicolor occurs all over the trunk while candida occurs as a flexural rash at extremes of age or in the immunocompromised, diabetic or patients on antibiotics.Treatment with topical steroids often causes confusion making tinea less scaly and more erythematous. Steroid use also makes the 'active' edge and the inactive centre less distinct (tinea incognito). Clinically the diagnosis can be difficult, but if it is a possibility take scrapings for mycology. Other fungal infections look nothing like tinea. Other conditions to consider include:
Contact dermatitis
Seborrhoeic dermatitis
Intertrigo
Erythrasma
Mycosis fungoides
Alopecia areata
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