Which statement about pityriasis rosea is true?

• A. It is always caused by a bacterial infection
• B. It typically requires antifungal therapy
• C. It is diagnosed clinically, with biopsy rarely needed
• D. It always resolves in 1-2 days

Answer: (C)

Pityriasis rosea is a self-limited skin condition that is typically diagnosed based on its characteristic appearance rather than tests. The classic sequence starts with a herald patch, followed by a widespread eruption on the trunk that often shows a “Christmas-tree” pattern and fine scaling along the edges. Because this presentation is usually distinctive, biopsy is rarely needed to confirm the diagnosis.

It’s not caused by bacteria, and antifungal therapy isn’t indicated unless there’s a separate fungal infection suspected. The course is gradual and self-limited, typically lasting weeks (often around 6–8 weeks), not resolving in just 1–2 days.