Telogen Effluvium: What are upright regrowing hairs (URH)?

URH in TE

Telogen effluvium refers to a type of hair loss whereby the patient experiences increased daily shedding. Shedding typically occurs 2-3 months after a "trigger" such as weight loss, surgery, illness, low iron, crash diet, medication initiation or development of some internal illness.

Dermoscopy (shown here) does not have many specific findings in patients with telogen effluvium although many upright regrowing hairs (URH) may be seem along with hair follicles containing only a single hair follicle.