Anagen effluvium is induced by all except –
**Anagen Effluvium and Its Causes**
**Core Concept**
Anagen effluvium is a form of hair loss characterized by the rapid shedding of hair during the anagen phase, which is the active growth phase of hair follicles. This condition is often caused by systemic factors that disrupt the normal growth cycle of hair.
**Why the Correct Answer is Right**
Anagen effluvium is typically induced by systemic factors such as chemotherapy, radiation therapy, and certain toxins. These substances can damage the rapidly dividing cells in the hair follicles, leading to the premature entry of hair into the telogen phase and subsequent shedding. In contrast, the conditions listed below are more commonly associated with different forms of hair loss.
**Why Each Wrong Option is Incorrect**
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**Clinical Pearl / High-Yield Fact**
Anagen effluvium is often used as a marker of systemic toxicity in patients undergoing chemotherapy or radiation therapy. Monitoring for anagen effluvium can help clinicians adjust treatment regimens to minimize harm to the patient.
**Correct Answer:**