Most hair-loss drugs currently available may stop hair loss, but don’t cause hair to regrow. Now, new research suggests that a drug already used to treat people with other conditions could restore hair growth in patients with one disease that can cause hair loss.

In a small new study, three people who took a drug called ruxolitinib daily for four to five months saw a complete regrowth of their hair. The patients had a condition called alopecia areata, which is an autoimmune disease that causes the loss of hair from the scalp or other areas of the body.

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