HS Does Not Behave the Same Way in Everyone
Where it appears, how it progresses, what drives it internally — these vary considerably from person to person. Identifying the right subtype is not a formality. It shapes what treatment approach makes sense and why recurrence happens in the first place.
Same Name. Different Disease Expression.
Two people can both be diagnosed with HS and have almost nothing in common in terms of what's driving the condition. A 28-year-old woman with PCOS-linked axillary HS has a very different internal picture from a 45-year-old man with obesity-linked gluteal HS. Treating them identically is what creates long-term failure.
01 — Location
Where It Appears Reflects Specific Anatomy and Triggers
Axillary HS is shaped by friction and sweat. Groin HS has stronger hormonal links. Perianal HS is often tied to gut inflammation. Location matters because it points to the microenvironment that's sustaining the condition.
02 — Pattern
How It Progresses Tells You What's Driving It
A condition that flares cyclically with hormonal shifts is different from one that drains chronically regardless of external changes. Pattern recognition guides what internal systems need correction — not just what the lesions look like.
03 — System
Internal Links Determine Whether Treatment Works Long-Term
HS linked to insulin resistance behaves differently from HS driven primarily by gut dysbiosis or hormonal excess. Identifying the systemic driver is what allows treatment to interrupt the recurrence cycle rather than just respond to it.
Where HS Appears — and What That Means
Each location carries its own set of anatomical and systemic factors. These are not just geographic differences — they reflect different trigger profiles and progression tendencies.
Location — Underarms
Axillary Hidradenitis Suppurativa
The most common presentation. Friction, heat, and sweat create an environment where blocked follicles become persistently inflamed. In women, hormonal fluctuations — especially around the cycle — intensify activity. This subtype is often where the condition is first noticed, but internal drivers have usually been active for some time before lesions appear.
Why It Tends to Recur
Skin-on-skin contact creates constant mechanical irritation — local treatment alone cannot remove this
Hormonal cycles in women create predictable inflammation windows that external care cannot interrupt
Repeated antibiotic courses disrupt the local microenvironment, often worsening the underlying inflammatory pattern
Scarring from previous lesions creates structural changes that make future blockage more likely
Location — Groin / Inguinal
Groin & Inguinal HS
Strong hormonal links, particularly in women with PCOS or androgen dominance. The groin area has a dense concentration of apocrine glands and lymphatic tissue — making it highly reactive to hormonal and metabolic imbalance. Recurrence here is often a clear signal that hormonal correction is needed as part of treatment.
Location — Buttocks
Gluteal HS
Often associated with prolonged sitting, obesity-related metabolic dysfunction, and chronic inflammation. Gluteal HS tends to progress more toward tunnel formation and scarring than other locations. Lesions here may be less visible to the patient, leading to later presentation and more established disease.
Location — Perianal
Perianal HS
This presentation has a particularly strong link to gut health. Inflammation from the digestive system can spill over into the perianal tissue, creating a persistent cycle that local treatment cannot resolve. Patients in this group often have co-existing digestive issues — irregular bowel patterns, bloating, or gut sensitivity — that go unaddressed.
Location — Under-Breast
Breast & Inframammary HS
Almost exclusively affects women. Hormonal fluctuation, moisture, and friction combine in this area. There is often a direct relationship with body weight — increased inframammary tissue creates both mechanical friction and metabolic influence through adipose-driven hormonal activity. This subtype is emotionally difficult and often undertreated due to social embarrassment around disclosure.
How the Lesions Behave
Beyond location, HS is also classified by the structural pattern of its lesions. These patterns reflect how advanced the underlying inflammatory process has become.
Pattern — 01
Single Lesion HS
One or two lesions appearing in a single area, often early-stage. Though limited in number, the same internal drivers are present. Addressing them at this stage produces the most predictable outcomes — the disease has not yet established the architectural changes that make later stages harder to reverse.
Pattern — 02
Clustered HS
Multiple lesions grouped in one area, often at different stages of development. Some healing while others form. This pattern usually indicates that inflammatory load has reached a threshold where the body can no longer contain individual lesions before new ones begin. Internal correction is essential to interrupt this cycle.
Pattern — 03
Multifocal HS
Active lesions in two or more distinct anatomical areas simultaneously. This pattern almost always involves multiple systemic drivers — not just a local trigger. Multifocal HS is the clearest indicator that the condition is systemic in origin and requires multi-layer treatment across all contributing systems.
The Internal Driver That's Sustaining the Condition
In many patients with recurring HS, a specific internal system is the primary engine behind the disease. Identifying this system — and correcting it — is what separates temporary relief from sustained remission.
System — Hormonal
Hormonal HS — PCOS-Linked
In women with PCOS or androgen dominance, the hormonal environment creates a persistent state of follicular sensitivity and inflammation. Lesions often flare predictably around the menstrual cycle or worsen during hormonal transitions. This pattern rarely responds well to antibiotics or local treatment alone — the underlying hormonal driver continues to sustain the condition regardless of what is done at the skin level.
What this means for treatment
Hormonal correction — not just inflammation control — must be part of the approach. Without it, the condition continues its cycle despite surface-level management.
System — Metabolic
Obesity-Linked & Insulin Resistance HS
Excess adipose tissue is not merely a mechanical factor — it is metabolically active. It produces pro-inflammatory signals that maintain a state of low-grade systemic inflammation, creating conditions where HS finds it easier to persist. Insulin resistance compounds this by disrupting the hormonal environment and creating further immune dysregulation. Weight loss alone rarely resolves the condition, but metabolic correction is a critical component of treatment.
What this means for treatment
Metabolic normalisation — gut health, insulin sensitivity, inflammation load — needs to be addressed in parallel with local treatment.
System — Post-Antibiotic
Post-Antibiotic Resistant HS
Years of antibiotic use can significantly alter the gut microbiome, which in turn affects immune regulation. In some patients, what initially appeared as antibiotic-responsive HS gradually stops responding — and may even worsen after courses end. The disrupted gut flora sustains a state of immune dysregulation that makes the skin more reactive, not less. This pattern requires gut restoration as a primary treatment focus.
What this means for treatment
Gut restoration is central. Re-regulating the immune response from the inside out — rather than suppressing it from the outside — is what creates improvement in this pattern.
System — Recurrent Post-Surgical
Recurrent Post-Surgical HS
Surgery removes the existing lesion but does not change the internal environment that created it. Patients who have undergone surgical excision and experienced recurrence at the same or adjacent site are in this group. The recurrence is not a surgical failure — it is the internal driver continuing to express through a structurally repaired but internally unchanged system.
What this means for treatment
Without internal correction, recurrence is expected regardless of how thorough the surgical intervention was. Internal system correction must follow — or precede — any surgical decision.
How the Disease Is Acting Right Now
Beyond location and systemic links, the current behaviour of HS determines how urgent intervention is and which treatment phase is most relevant at this point.
Behaviour — 01
Acute Flaring HS
Active, painful lesions that appear suddenly and intensify over days. Often triggered by specific events — hormonal shifts, stress, dietary changes, illness. The inflammatory cascade is in full activation. At this stage, reducing the acute inflammatory load is the priority — but identifying the trigger is equally important to prevent the next flare.
Behaviour — 02
Chronic Draining HS
Persistent low-grade drainage from established lesions or tunnels, often without acute flaring. The body has reached a kind of equilibrium with the disease — containing but not resolving it. This pattern is often associated with long-standing disease and significant inflammatory burden. Patients frequently underreport this as "the normal state" because it has become familiar.
Behaviour — 03
Steroid-Dependent HS
Flares that only quieten with steroid intervention, returning when the course ends. The condition has adapted to suppression — inflammation rebounds once the suppressive agent is removed. Over time, steroid dependency also creates its own complications: metabolic disruption, immune alteration, and increasingly short windows of relief. The suppression cycle needs to be broken.
Behaviour — 04
Recurrent Post-Treatment HS
Returns reliably after any intervention — antibiotics, steroids, or surgery — ends. This pattern is perhaps the most diagnostically clear: it tells you directly that the treatment being applied is not addressing the root driver. The disease has an established internal pattern that has not been interrupted. Each recurrence, if left unaddressed, tends to be slightly more established than the last.
Knowing Your Subtype Is Where Structured Treatment Begins
If your HS keeps returning — regardless of what you have tried — it usually means the specific drivers behind your subtype have not been addressed. A personalised evaluation identifies which systems are involved and what a structured approach looks like for your pattern.