Anesthesia
Pain management and sedation techniques
Angiology
Arterial and venous pathologies
Cardiology
Acquired and congenital heart diseases
Dentistry
Diseases of teeth, gums, and the oral cavity
Dermatology
Disorders of the skin and subcutaneous tissue
Endocrinology
Disorders of the glands and hormonal imbalance
Gastroenterology
Stomach, intestinal, and digestive diseases
Gynecology
Diseases of female reproductive organs
Hepatology
Liver, gallbladder, and biliary tract diseases
Neurology
Brain, spinal cord, and peripheral nerve disorders
Obstetrics
Pregnancy complications and abnormal fetal positions
Oncology
Cancer types, benign and malignant tumors
Ophthalmology
Conditions affecting the eyes and vision
Otorhinolaryngology
Ear, nose, and throat diseases
Pediatrics
Child health, development, and clinical conditions
Physiology
Biological processes within organs and systems
Pulmonology
Lung and respiratory tract diseases
Traumatology
Acute injuries and musculoskeletal trauma
Urology
Urinary tract and male reproductive disorders
Anesthesia
Pain management and sedation techniques
Angiology
Arterial and venous pathologies
Cardiology
Acquired and congenital heart diseases
Dentistry
Diseases of teeth, gums, and the oral cavity
Dermatology
Disorders of the skin and subcutaneous tissue
Endocrinology
Disorders of the glands and hormonal imbalance
Gastroenterology
Stomach, intestinal, and digestive diseases
Gynecology
Diseases of female reproductive organs
Hepatology
Liver, gallbladder, and biliary tract diseases
Neurology
Brain, spinal cord, and peripheral nerve disorders
Obstetrics
Pregnancy complications and abnormal fetal positions
Oncology
Cancer types, benign and malignant tumors
Ophthalmology
Conditions affecting the eyes and vision
Otorhinolaryngology
Ear, nose, and throat diseases
Pediatrics
Child health, development, and clinical conditions
Physiology
Biological processes within organs and systems
Pulmonology
Lung and respiratory tract diseases
Traumatology
Acute injuries and musculoskeletal trauma
Urology
Urinary tract and male reproductive disorders
A pustule (Latin pustula) is a primary cavity filled with purulent contents (leukocytes, cellular detritus, bacteria). The color of the contents is usually yellowish or greenish. Pustules may be follicular (associated with a hair follicle) or nonfollicular.
Etiology and pathophysiology
Bacterial infections (staphyloderma) are the most common cause, but sterile pustules also exist (e.g., in psoriasis).
Follicular pustules: Characteristic of folliculitis, common acne (acne).
Phlyctenes: Flat, flabby superficial pustules characteristic of streptococcal impetigo.
Clinical significance
The depth of the pustule determines the outcome: superficial pustules heal without trace or with temporary pigmentation, deep pustules may leave behind scars.