Apocrine Sweat Gland Disorders

Apocrine sweat glands are specialized sweat glands located particularly in the axillae, groin, and around the mammary region. These glands become active from puberty onward, and their secretions can interact with bacteria on the skin surface, potentially leading to smell formation. Apocrine sweat gland disorders encompass a group of conditions characterized by excessive activity, insufficient activity, or abnormal secretion production by these glands.

Unlike eccrine sweat glands, apocrine sweat glands are larger in structure and their secretions are rich in protein and lipid. These glands are controlled by sympathetic nervous system and become active in response to emotional stress, temperature changes, and hormonal factors.

Apocrine sweat glands originate in the deep layers of the epidermis and are associated with hair follicles. Their secretions reach the skin surface directly through the hair shafts. The cells within these glands operate via an apocrine secretion mechanism, distinct from the merocrine mechanism; that is, a portion of the cell cytoplasm is released along with the secretion together.

• Thermoregulation: Unlike eccrine glands, apocrine sweat glands do not directly contribute to temperature regulation.
• Pheromone Secretion: Pheromones are believed to play an important role in human social interactions.
• Protective Barrier: Lipid-rich secretions moisturize the skin surface and form a protective barrier against bacterial infections.

Disorders related to apocrine sweat glands typically manifest as excessive sweating (hyperhidrosis), unpleasant odor (bromhidrosis), or inflammation (hidradenitis suppurativa).

Hyperhidrosis is a condition resulting from overactivity of apocrine sweat glands. It is most prominently observed in the axillary and groin regions. Primary hyperhidrosis develops in association with genetic factors, while secondary hyperhidrosis may be linked to hormonal changes or certain systemic diseases.

Bromhidrosis is characterized by the development of unpleasant odor due to bacterial breakdown of apocrine gland secretions. This situation typically arises as a result of poor hygiene and can lead to psychosocial road.

Hidradenitis suppurativa is a chronic inflammatory disease of the apocrine sweat glands. It presents with painful nodules, abscesses, and fistulas, particularly in the axillary and groin regions. Disease typically arises from the interaction of genetic and environmental factors.

1. Stage I: Formation of one or multiple painful nodules.
2. Stage II: Recurrent abscesses, fistula development, and scarring.
3. Stage III: Extensive fistulas, chronic inflammation, and tissue loss.

The diagnosis of apocrine sweat gland disorders is based on clinical examination and patient history. The following methods may be used to support diagnosis:

• Sweat Tests: Gravimetric tests and starch-iodine tests are used in the diagnosis of hyperhidrosis.
• Biopsy: Histopathological examination of tissue samples is performed to confirm diagnoses such as hidradenitis suppurativa.
• Bacterial Culture: Used to identify bacteria responsible for odor in bromhidrosis cases.

The treatment of apocrine sweat gland disorders includes medical and surgical approaches. Treatment selection depends on disease severity, the patient’s overall health status, and its impact on quality of life.

• Antiperspirants: Solutions containing aluminum chloride may be effective in mild cases of hyperhidrosis.
• Topical and Systemic Antibiotics: Used in conditions with infectious components such as hidradenitis suppurativa.
• Botulinum Toxin (Botox): Reduces sweating by blocking neural stimulation of apocrine sweat glands.
• Immunosuppressive Agents: Agents such as TNF-alpha inhibitors may be used in severe cases of hidradenitis suppurativa.

• Laser Therapy: Targets apocrine sweat glands to reduce sweat production.
• Local Excision: Performed to remove chronic lesions in cases of hidradenitis suppurativa.
• Sympathectomy: A surgical procedure that interrupts nerve stimulation, used in severe cases of hyperhidrosis.