Which condition is characterized by the loss of hair in patches?

• A. Alopecia areata
• B. Androgenetic alopecia
• C. Telogen effluvium
• D. Traction alopecia

Answer: (A)

Alopecia areata is characterized specifically by the sudden loss of hair in round patches on the scalp or other areas of the body. This condition is considered an autoimmune disorder, where the immune system mistakenly attacks hair follicles, leading to hair falling out in small areas.

The nature of alopecia areata distinguishes it from other types of hair loss. For instance, androgenetic alopecia typically leads to gradual thinning of hair and is often referred to as male or female pattern baldness. Telogen effluvium involves temporary hair shedding due to stress or changes in bodily conditions, which also doesn’t match the patchy loss seen in alopecia areata. Traction alopecia results from prolonged tension or pulling on the hair, leading to hair loss in areas of stress, which is again different from the patchy nature that defines alopecia areata.