A 24-year-old woman with no prior acne history presents with a 3-week explosive eruption of painful facial lesions confined to the cheeks, chin, forehead, and nose. Examination reveals the feature marked **B** in the diagram—crops of large fluctuant nodules and draining sinuses with seropurulent discharge. The lesions are intensely tender and bright-red to cyanotic. Notably, there are no comedones, and the chest and back are completely spared. Bacterial cultures grow only normal skin flora. Which of the following is the most likely diagnosis?
A. Staph aureus furunculosis with abscess formation
B. Severe cystic acne vulgaris with bacterial superinfection
C. Pyoderma faciale (rosacea fulminans)
Acne conglobata with secondary infection
D.
Explanation
Why Pyoderma faciale (rosacea fulminans) is right
The clinical presentation is pathognomonic for pyoderma faciale: an explosive, centrofacial eruption of large fluctuant nodules and draining sinuses (marked B) in a postadolescent woman with NO prior acne history, NO comedones, and NO truncal involvement. The absence of comedones is the critical morphologic clue that excludes acne variants. Pyoderma faciale is a rare, severe inflammatory variant of rosacea triggered by stress, hormonal shifts, or systemic inflammation—not bacterial infection (cultures are sterile or show only normal flora). Management requires urgent systemic corticosteroids followed by isotretinoin to prevent scarring (Plewig G, Jansen T, Kligman AM. Pyoderma faciale. Arch Dermatol. 2023; NICE rosacea 2024).
Why each distractor is wrong
Acne conglobata with secondary infection: Acne conglobata is a severe form of acne vulgaris that presents with interconnected abscesses and sinus tracts, BUT it always has a prior history of acne and ALWAYS contains comedones (open and closed). The absence of comedones excludes this diagnosis entirely.
Staph aureus furunculosis with abscess formation: Furunculosis typically presents as isolated, painful nodules and abscesses in hair-bearing areas (neck, axillae, buttocks), not as a centrofacial eruption. The distribution and centrofacial coalescence are atypical for furunculosis, and the acute onset without prior skin disease argues against recurrent staph infection.
Severe cystic acne vulgaris with bacterial superinfection: Severe cystic acne always has a prior history of acne and ALWAYS contains comedones, which are entirely absent in this patient. The explosive 3-week onset without prior acne is incompatible with cystic acne vulgaris.
High-YieldNEET PG
Pyoderma faciale = centrofacial nodules + draining sinuses + NO comedones + NO truncal involvement + postadolescent woman + explosive onset = rosacea fulminans, NOT acne.
