Diagnosis
Discoid eczema
Diagnosis of discoid eczema primarily relies on clinical examination by a healthcare professional. Bacterial swabs may reveal colonization or infection with Staphylococcus aureus, and scrapings are often obtained for mycology to differentiate from other similar conditions. Patch testing may be considered to identify potential contact allergens contributing to chronic discoid eczema. Differential diagnosis includes distinguishing discoid eczema from other annular skin eruptions such as tinea corporis, plaque psoriasis, and pityriasis rosea.
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