The delay has reasons
Many people affected by acne inversa do not experience it as a clear, immediately recognisable story. At first there may be a painful noduleNodule: A firm, palpable lump deep in tissue. Nodules can be painful and may progress to abscesses. They are among the typical early signs of Acne Inversa., later an abscessAbscess: An inflamed cavity or swelling containing pus or fluid. In hidradenitis suppurativa, abscesses can form as part of the inflammatory disease process and do not automatically mean that a bacterial infection is present. Secondary bacterial infection can occur and may require separate medical assessment. In Acne Inversa, abscesses occur mainly in the armpits, groin, and other skin folds., then a quiet phase. A German study on diagnostic delayDiagnostic Delay: The average time between first symptoms and a correct Acne Inversa diagnosis. Repeatedly measured at roughly 7 to 10 years in international studies. Reducing this delay is one of the single most important advocacy goals in the HS field. reported an average period of about ten years between the first symptoms and the diagnosis.
This is not about blame. It shows how easily HS can be read as a series of separate skin problems in its early course.
Early HS often doesn’t look clear-cut
A deep, inflamed nodule can initially resemble a boilBoil (Furuncle): Patient-community term for an inflammatory nodule or abscess. Important caveat: an ordinary single boil (furuncle) is a one-off bacterial hair-follicle infection. The recurring, multifocal 'boils' of Acne Inversa are not the same thing — this misdiagnosis is a main reason HS goes unrecognised for years., folliculitis, an inflamed cystCyst: A fluid- or keratin-filled sac under the skin. In Acne Inversa some lesions resemble epidermoid cysts but differ histologically. The term is used loosely in clinical practice., or an ingrown hair. If only the current spot is visible at the appointment, the recurring overall pattern remains easier to miss.
Flare-ups fit poorly into appointments
HS can fluctuate. A spot may have healed by the scheduled appointment, even though it was very painful or oozing shortly before. Without information on the course, the affected body areas, and previous episodes, the condition can seem smaller than it actually is in everyday life.
Intimate body areas make it harder to talk about
The armpits, groin, genital and perianal region, buttocks, or skin folds under the breast are not always easy to show or describe. Shame, worries about odour, and poor previous experiences can lead people to shorten their description of symptoms or postpone appointments.
There is no single test that proves the diagnosis
The diagnosis is made clinically. Medical professionals assess the lesions, their locations, and the course over time. Blood tests, swabs, or other examinations can help, depending on the situation, to assess complications or rule out other causes. However, they do not replace looking at the overall pattern.
Acute care can obscure the pattern
A painful abscess needs attention. If every episode is treated only as an isolated acute event, questions about recurrence, scarring, and typical body regions can get too little attention.
What makes the diagnosis easier to recognise sooner
Bring as much concrete information as possible to the appointment:
- affected body areas,
- approximate frequency of episodes,
- photos of active spots, if available,
- scarring, dischargeDischarge / Exudate: Fluid coming from an Acne Inversa lesion or tunnel. Can be clear (serous), bloody (sanguineous), pus-like (purulent), or a mix., or recurring openings,
- previous diagnoses and treatments.
This turns “recurring inflammation” into a traceable medical history.
Terms explained in this article
Quick definitions of the key medical terms. Select any term for its full glossary entry.
- Nodule
- A firm, palpable lump deep in tissue. Nodules can be painful and may progress to abscesses. They are among the typical early signs of Acne Inversa.
- Abscess
- An inflamed cavity or swelling containing pus or fluid. In hidradenitis suppurativa, abscesses can form as part of the inflammatory disease process and do not automatically mean that a bacterial infection is present. Secondary bacterial infection can occur and may require separate medical assessment. In Acne Inversa, abscesses occur mainly in the armpits, groin, and other skin folds.
- Diagnostic Delay
- The average time between first symptoms and a correct Acne Inversa diagnosis. Repeatedly measured at roughly 7 to 10 years in international studies. Reducing this delay is one of the single most important advocacy goals in the HS field.
- Boil (Furuncle)
- Patient-community term for an inflammatory nodule or abscess. Important caveat: an ordinary single boil (furuncle) is a one-off bacterial hair-follicle infection. The recurring, multifocal 'boils' of Acne Inversa are not the same thing — this misdiagnosis is a main reason HS goes unrecognised for years.
- Cyst
- A fluid- or keratin-filled sac under the skin. In Acne Inversa some lesions resemble epidermoid cysts but differ histologically. The term is used loosely in clinical practice.
- Flare
- A period of acute worsening in a chronic condition. In Acne Inversa, a flare may be triggered by stress, hormonal changes, friction, or other factors and can manifest as new nodules, abscesses, or increased pain.
- Discharge / Exudate
- Fluid coming from an Acne Inversa lesion or tunnel. Can be clear (serous), bloody (sanguineous), pus-like (purulent), or a mix.
References
- Delayed diagnosis of hidradenitis suppurativa and its effect on patients and healthcare system Dermatology, 2020
- S2k-Leitlinie zur Therapie der Hidradenitis suppurativa / Acne inversa AWMF, 2024
- North American clinical management guidelines for hidradenitis suppurativa, Part I Journal of the American Academy of Dermatology, 2019
