Which of the following conditions is not a skin disease:
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Answer: C. Erythema migrans
Explanation
Erythema migrans, also known as geographic tongue or benign migratory glossitis, is an inflammatory condition affecting the oral mucosa rather than being a skin disease. It presents as atrophic patches on the tongue dorsum surrounded by elevated white borders that migrate over time. This benign condition is restricted to the oral mucosal tissues and does not represent a cutaneous skin pathology. Erythema migrans, or benign migratory glossitis, is a common asymptomatic inflammatory disorder of the tongue mucosal surface. It is characterized by loss of filiform papillae giving red patches that change shape and location within days. The condition is completely benign and typically requires no treatment other than reassurance and patient education.
Option A describes erythema multiforme, an acute immune-mediated condition that frequently produces target skin lesions alongside oral blisters. Option B refers to keratosis follicularis, also known as Darier disease, which is a genetic skin disorder featuring hyperkeratotic papules. Option D describes psoriasiform lesions, which are classic cutaneous manifestations associated with psoriasis skin disease.
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