Brian Kim | St. Louis Public Radio

Brian Kim

Robert Boston | Washington University School of Medicine

Dermatologist Brian Kim has seen many patients who can't seem to stop itching. Often, it's difficult to determine what's causes the irritation, which can make deciding a course of treatment challenging.

"Most of the drugs I use only work a small minority of the time, so we have to be patient," said Kim, co-director of Washington University's Center for the Study of Itch. "But as you can imagine, as a patient, when you fail with three different medications, it can be incredibly frustrating."