Figure 1

Diffuse decrease in hair density secondary to rapid conversion of anagen to telogen hair. Precipitated by stressful events, illness, fever, pregnancy, crash diet, medications; hair can be shed 2-6 mo after precipitant.

Physical: Diffuse hair loss; positive hair pull test (>10% club hairs).

Investigations: CBC, ferritin, TSH; punch biopsy if unsure.

DDx: Alopecia areata, anagen effluvium, androgenetic alopecia.

Management

Reassurance. Wait for regrowth, and treat any underlying cause. Topical minoxidil may be beneficial.