I recommend Simpi Dermatology in Dongrae-gu.

A friend recommended Sim Dermatology. They said they were very kind and explained everything clearly. I knew this, and then I started having skin problems, so I went in. They kindly explained that it was due to the sudden hot weather. They also gave me helpful advice on how to deal with it.
While many other places focus on procedures, this one feels like they're providing treatment for your needs, so I highly recommend it. It's located in the Dongrae Medical Center near the Hanjeon Electric Power Corporation, making it easy to find.