Which skin condition is characterized as an autoimmune disorder that results in hair loss?

• A. Alopecia areata
• B. Tinea pedis
• C. Vitiligo
• D. Decubitus ulcer

Answer: (A)

Alopecia areata is indeed characterized as an autoimmune disorder that leads to hair loss. In this condition, the immune system mistakenly attacks the hair follicles, inhibiting their ability to produce hair. This can result in patchy hair loss on the scalp and other areas of the body. The exact cause of this autoimmune reaction remains unclear, but it is thought to involve a combination of genetic and environmental factors.

Other conditions listed do not align with the description of an autoimmune disorder leading to hair loss. Tinea pedis is a fungal infection affecting the skin on the feet, commonly known as athlete's foot, and does not involve hair loss. Vitiligo is another autoimmune condition, but it causes loss of skin pigmentation rather than hair loss. Decubitus ulcers, also known as pressure sores or bedsores, are injuries to the skin and underlying tissue due to prolonged pressure, and are not associated with hair loss. Therefore, alopecia areata is the correct answer as it directly fits the criteria of the question.