A drug approved to treat eczema provided significant improvement in the symptoms of patients with severe itching diseases that currently have no targeted treatments, according to a new study. The drug, abrocitinib, was found to cause minimal side effects during a small 12-week study. It was beneficial for those with an itching disease called prurigo nodularis as well as for those with chronic pruritus of unknown origin, a condition that causes chronic unexplainable itching symptoms.