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The first sign of hidradenitis suppurativa (HS) may be little, itchy pimples or huge, painful sores. HS is a chronic inflammatory skin disease that is uncomfortable. 

Recognizing the locations of HS bumps should aid with early diagnosis and therapy.

HS most typically impacted areas?

HS pimples are most commonly found in the armpit. Other affected places range from the most common to the least common:

  • The groin (the folds that connect the abdomen to the legs)
  • Area between the anus and the genitals and surrounds the anus
  • Breasts and the area beneath the breasts
  • Buttocks
  • Public space
  • Scalp of the Chest
  • between the ears
  • On the upper eyelids
  • Individuals with HS bumps around the anus and genitals may also have them in the anal canal.

Bumps commonly occur as the disease progresses when sections of the body brush against one another. The nape of the neck, the inner thighs, below the breasts, and around the waist are all possible locations.

The scrotum and vulva are two other common locations for HS pimples. Stray lumps on the abdomen, particularly around the belly button, are possible.

Apocrine glands and terminal hair follicles can be found in many of the affected locations. Apocrine glands are smell glands that become active after puberty and are mostly found in the armpits and groin. Apocrine perspiration is greasy, viscous, and has no odor. The odor is caused by bacteria decaying. Terminal hairs are thick hairs that grow on the scalp as well as in the armpits, beard, and pubic area after puberty.

The location of HS bumps varies per gender. Lesions (sores) are more common in women beneath the breasts, as well as in the armpits and groin. Lesions on the buttocks, around the anus, on the scalp at the nape of the neck, and behind the ear are more common in men.

Bumpy or painful spots caused by other factors

HS regions are categorized in three categories: axillary-mammary, follicular, and gluteal.


This group accounted for roughly half of those studied, which is typical of high schools. The majority of the group’s members were female. Lesions were most commonly found on the front of the body, the armpit (axillary), and the breast (mammary). The people were most likely scarred. The other half of the participants in the study were evenly divided into two atypical groups.


In addition to the breast and armpit, hair follicle lesions in this group were more likely on the:

  • Ears
  • Chest 
  • Back 
  • Legs
  • Pilonidal sinus (a tiny skin hole or tube near the top of the buttocks)

There were more men and smokers in the group. They were more likely than the other groups to have:

  • Acne that is severe
  • HS family history
  • HS that is more severe
  • An earlier onset of disease
  • Increased disease duration


Lesions on the buttocks (gluteal) were more common in this group. Papules (solid bumps without pus) and folliculitis (inflammation caused by infection in hair follicles) were present in the patients. They were more likely to be smokers and to have had the disease for a longer period of time than the axillary-mammary group. They were less obese and had less serious illness.

Clarifying patterns should make it easier to identify HS. Avoiding protracted diagnostic delays can help reduce pain and avert more serious disease symptoms.


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