REPORT OF A CASE
A 34-year-old white woman presented with a severalmonth history of two asymptomatic plaques on her chest. Review of systems and history were unremarkable. Physical examination revealed two well-demarcated, smooth, nonscaly erythematous plaques on her chest (Figure 1 and Figure 2). A potassium hydroxide preparation was negative. The skin biopsy specimen with special stain is shown in Figure 3 and Figure 4.What is your diagnosis?Figure 1.Figure 2.Figure 3.Figure 4.
Plaquelike cutaneous mucinosis (PCM).
HISTOPATHOLOGIC FINDINGS AND CLINICAL COURSE
Alcian blue staining showed increased quantities of acid mucopolysaccharides.The patient was treated with 0.1% triamcinolone ointment twice daily for 2 weeks with minimal improvement. She was then offered antimalarials; however, she declined further therapy.
Plaquelike cutaneous mucinosis is an uncommon disorder of increased mucin deposition. A similar more common condition presenting with reticular lesions is called reticular erythematous mucinosis (REM). Patients
Rotman DA, Blauvelt A. Two Asymptomatic Plaques on the Chest of a Young Woman. Arch Dermatol. 1994;130(11):1437–1438. doi:10.1001/archderm.1994.01690110103020
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