Acne Conglobata and Acne Fulminans
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Direct answer
Acne conglobata is a severe, nodulocystic form of acne with interconnected sinus tracts, abscesses and extensive scarring, mainly of the face, back, chest and buttocks. Acne fulminans is an abrupt, ulcerative variant that adds systemic features such as fever, arthralgia and raised inflammatory markers. Isotretinoin is central to conglobata, whereas fulminans needs urgent systemic corticosteroids and isotretinoin only under specialist supervision.
What you must remember
- Acne conglobata: severe nodulocystic acne with communicating sinus tracts, abscesses and scarring, classically on the face, back, chest and buttocks.
- Acne fulminans: sudden onset of ulcerative nodulocystic acne with systemic features, most often in young men.
- Systemic features: fever, malaise, arthralgia or arthritis, leucocytosis and raised ESR and CRP mark fulminans and distinguish it from conglobata.
- Bone involvement: fulminans can produce bone pain and osteolytic change, classically around the sternoclavicular region, so imaging is considered.
- Triggers: acne fulminans has been reported at the start of isotretinoin, and anabolic steroid use is another recognised association.
- Conglobata treatment: isotretinoin is the cornerstone, with intralesional steroid for large, inflamed nodules.
- Fulminans treatment: systemic corticosteroids control the inflammation, and isotretinoin is restarted only once the disease is quiet and under specialist supervision.
Recognising a severe acne variant
A 22-year-old man develops painful, ulcerated nodules on the chest and back over ten days, with fever and joint pain. The steps separate a severe sinus-forming acne from a systemic inflammatory variant and set the urgency of treatment.
- Map the lesions: Document whether nodules are interconnected by sinus tracts and whether ulceration and abscess formation are present. Conglobata shows communicating tracts, while fulminans adds abrupt ulceration.
- Look for systemic features: Ask about fever, malaise and joint pain, and check for arthritis or tender bones. Their presence moves the diagnosis towards acne fulminans and calls for urgent review.
- Check the inflammatory markers: Full blood count, ESR and CRP are measured, with raised values supporting systemic inflammation. Imaging of the sternum and clavicles is considered when bone pain is present.
- Review recent drugs: Ask about any isotretinoin started in the past weeks and about anabolic steroid use. A trigger changes the immediate management.
- Start systemic steroids for fulminans: Oral prednisolone is given to control the systemic inflammation rapidly, then tapered as the lesions settle. Antibiotics alone are inadequate for this picture.
- Plan isotretinoin with care: For conglobata, isotretinoin is started with monitoring, with intralesional steroid for large nodules. For fulminans, isotretinoin is restarted only once quiet and under specialist supervision.
Where the exam tries to catch you
Severe acne questions test the difference between conglobata and fulminans and the urgency that systemic features demand.
- Trap: treating conglobata with topical retinoids alone. Correct: sinus-forming disease needs isotretinoin, because topical therapy cannot control deep, communicating lesions.
- Trap: treating acne fulminans as severe acne managed with antibiotics. Correct: the systemic features need prompt corticosteroids, and antibiotics do not control the picture.
- Trap: confusing acne conglobata with hidradenitis suppurativa. Correct: hidradenitis affects apocrine sites such as the axillae and groin, whereas conglobata favours the face, back, chest and buttocks.
- Trap: restarting isotretinoin after fulminans without steroid cover. Correct: isotretinoin is restarted only with steroid cover and specialist supervision, since it can be the trigger.
Frequently asked questions
What systemic features distinguish acne fulminans from acne conglobata?
Acne fulminans is distinguished from acne conglobata by systemic features such as fever, malaise, arthralgia or arthritis, leucocytosis and raised ESR and CRP. Acne conglobata is a severe local disease of sinus tracts and scarring without these systemic changes.
Which drug is central to the treatment of acne conglobata?
Isotretinoin is central to the treatment of acne conglobata, supported by intralesional corticosteroid for large inflamed nodules. Monitoring for lipids, liver enzymes and pregnancy is required throughout the course.
Why are systemic corticosteroids used in acne fulminans?
Systemic corticosteroids are used in acne fulminans to control the systemic inflammation and the ulcerative lesions quickly. They are tapered as the disease settles, and isotretinoin follows only when the disease is quiet.
How does acne conglobata differ from hidradenitis suppurativa?
Acne conglobata is a facial and truncal disease of pilosebaceous follicles with comedones, while hidradenitis suppurativa affects apocrine-rich sites such as the axillae and groin, where double-ended comedones may occur but facial involvement is not typical. Both can form sinus tracts, which is why the distribution is the key distinguishing feature.