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HS Education

HS vs Boils: What Is the Difference?

Hidradenitis Suppurativa is frequently mistaken for recurring boils. While they can look similar, the underlying causes, patterns, and treatments are fundamentally different.

Why This Distinction Matters

Many people with HS spend years being treated for recurring boils or skin infections, receiving repeated courses of antibiotics that provide only temporary relief. Understanding the difference between HS and boils is the first step toward getting the right diagnosis and the right treatment.

Hidradenitis Suppurativa

  • Chronic immune-mediated condition
  • Returns to the same locations repeatedly
  • Affects body fold areas specifically
  • Forms tunnels and causes scarring
  • Requires long-term specialist management
  • Not cured by antibiotics alone

Boils (Furuncles)

  • Bacterial infection (usually Staph aureus)
  • Usually a single episode or occasional recurrence
  • Can appear anywhere on the body
  • Heals cleanly without tunnels
  • Resolves with short-term treatment
  • Usually cured by antibiotics or drainage
Side-by-side medical illustration comparing Hidradenitis Suppurativa (deep nodules, sinus tunnels, scarring) with a Boil (single infected hair follicle, surface-level pus cavity)

Illustration: Educational diagram only. Not a clinical photograph. Consult a dermatologist for diagnosis.

Detailed Comparison

A side-by-side look at 12 key features that distinguish HS from ordinary boils.

Feature
Hidradenitis Suppurativa
Boil (Furuncle)
Cause
Chronic immune-mediated inflammation of hair follicles and apocrine glands
Bacterial infection (usually Staphylococcus aureus) of a single hair follicle
Location
Armpits, groin, inner thighs, buttocks, under breasts - body fold areas only
Can appear anywhere on the body where hair follicles exist
Recurrence
Chronic and recurring - returns repeatedly to the same locations over years
Usually a single episode; may recur but not predictably in the same spot
Number of lesions
Often multiple lesions in multiple locations simultaneously
Usually one or a few isolated lesions at a time
Tunnels (sinus tracts)
Characteristic - interconnected tunnels form beneath the skin over time
Not present - boils do not form tunnels
Scarring
Progressive rope-like scarring and skin thickening in affected areas
May leave a small scar but significant scarring is uncommon
Blackheads
Double-headed or clustered blackheads (tombstone comedones) are common
No associated blackheads
Response to antibiotics
Partial or temporary improvement only; does not cure the condition
Usually resolves completely with a course of antibiotics
Hormonal triggers
Flares commonly worsen before menstrual periods and with hormonal changes
Not typically affected by hormonal cycles
Duration of individual lesion
Weeks to months; underlying inflammation persists even after surface healing
Days to 2 weeks; resolves completely once the infection clears
Associated conditions
Linked to metabolic syndrome, Crohn's disease, depression, and arthritis
Not typically associated with systemic conditions
Treatment approach
Requires long-term management: biologics, hormonal therapy, surgery, lifestyle
Short-term treatment: warm compresses, drainage, antibiotics if needed

The amber indicators for HS reflect the chronic, complex nature of the condition compared to the typically self-limiting nature of boils.

4 Key Differences to Remember

If you are unsure whether your symptoms are HS or boils, these four factors are the most important to consider.

🔄

Recurrence is the Defining Factor

A single boil can happen to anyone. When the same type of painful lesion returns to the exact same location repeatedly, this pattern is the most important indicator of HS rather than a simple infection.

📍

Location Tells the Story

Boils can appear anywhere. HS almost exclusively affects body fold areas where skin rubs against skin: armpits, groin, inner thighs, buttocks, and under the breasts. Lesions in these specific locations are a major diagnostic clue.

🌿

Antibiotics Are Not the Answer

If a painful skin lesion keeps coming back despite multiple courses of antibiotics, this strongly suggests HS rather than a simple bacterial infection. HS is driven by immune dysfunction, not bacteria.

🔗

Tunnels Are Unique to HS

The formation of interconnected tunnels (sinus tracts) beneath the skin is a hallmark of HS that does not occur with ordinary boils. If you can feel cord-like connections between lesions, this is a significant HS indicator.

When to See a Dermatologist

You should seek evaluation by a board-certified dermatologist if you experience any of the following:

  • Painful skin lesions that have returned to the same location two or more times
  • Lesions in the armpits, groin, inner thighs, or buttocks that do not fully resolve
  • Skin lesions that have not responded to multiple courses of antibiotics
  • Any lesion that appears to connect to another lesion beneath the skin
  • Progressive scarring or skin thickening in affected areas
  • Skin symptoms that worsen before your menstrual period

Learn More About HS

Understanding the difference between HS and boils is just the beginning. Explore these resources to learn more about HS symptoms, diagnosis, and living well with the condition.

Continue Your HS Education

Early Warning Signs|Misdiagnosis Guide|HS Stages Explained|Understand HS Hub

Medical References

  1. [1]Jemec GBE. Hidradenitis suppurativa. N Engl J Med. 2012;366(2):158-164. PubMed
  2. [2]Goldburg SR, Strober BE, Payette MJ. Hidradenitis suppurativa: epidemiology, clinical presentation, and pathogenesis. J Am Acad Dermatol. 2020;82(5):1045-1058. PubMed
  3. [3]Alikhan A, et al. North American clinical management guidelines for hidradenitis suppurativa. J Am Acad Dermatol. 2019;81(1):76-90. PubMed