Diagnosis of folliculitis/furuncles/carbuncles is based on:

• A. History and characteristic appearance of the lesions
• B. Laboratory culture only
• C. Radiographic imaging
• D. Family history of skin disease

Answer: (A)

Diagnosis of folliculitis, furuncles, and carbuncles is made mainly from clinical information—how the condition started and progressed—and what the lesions look like. Folliculitis shows as small red bumps or pustules centered on hair follicles, often with itching or mild tenderness. Furuncles are deeper, painful nodules that form from a folliculitis and may drain pus, while carbuncles involve multiple interconnected abscesses with broader redness and swelling. This pattern of history and typical appearance, along with the location on shaved or sweating areas and common risk factors like diabetes or poor hygiene, usually allows clinicians to identify the problem without needing tests first. Laboratory cultures can help tailor antibiotics or confirm the organism in stubborn, recurrent, or unusual cases, but they’re not required to establish the diagnosis initially. Radiographic imaging isn’t used for these superficial skin infections unless there’s concern for deeper extension or complications. Family history doesn’t establish the diagnosis, though it might inform risk, it doesn’t define the condition on its own.