Immune system
Alopecia areata
Non-infectious · Acute or chronic
An autoimmune condition in which the immune system attacks hair follicles, causing round patches of hair loss.
GeoMed · Skin (integumentary system) conditions
Skin (integumentary system) conditions
Causes, symptoms, diagnosis, treatment approaches and prevention for common conditions. Browse A–Z, by body system, or search.
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Skin (integumentary system) conditions
Immune system
Skin (integumentary system)
Alopecia (telogen effluvium)
Non-infectious · Acute
Temporary, widespread hair shedding that starts a few months after a stress to the body, such as illness, childbirth or crash dieting.
Digestive system
Anal warts
Infectious · Chronic
Small growths in and around the anus caused by the human papillomavirus (HPV), usually spread through sexual contact.
Immune system
Angioedema
Non-infectious · Acute
Swelling deep under the skin, often around the eyes, lips, tongue or throat, caused by fluid leaking from small blood vessels.
Respiratory system
Anthrax
Infectious · Acute
A serious bacterial infection caused by Bacillus anthracis, caught mainly from infected animals or animal products.
Skin (integumentary system)
Athlete's foot (tinea pedis)
Infectious · Acute
A common fungal infection of the skin of the feet, causing itchy, scaly or cracked skin, often between the toes.
Immune system
Atopic dermatitis (eczema)
Non-infectious · Chronic
A common long-term skin condition causing dry, itchy, inflamed skin that comes and goes in flare-ups.