- Autoimmune disease causing nonscarring alopecia
- Most common in children and young adults
- It most often affects the head or beard, resulting in well-circumscribed patches of hair loss.
- Severe cases may progress to alopecia totalis (loss of all hair on the head) or alopecia universalis (loss of all body hair).
- Peribulbar and intrabulbar lymphocytic infiltrate ("swarm of bees")
- Decreased anagen hairs and increased catagen and telogen hairs
- Increase in follicular stelae with lymphocytic infiltration
- Increase in miniaturized vellous hairs
- Pigment incontinence of hair bulbs