I recommend Nine9 Clinic in Ssangmun-dong (Dermatology).

Let me introduce Nine9 Clinic located in Ssangmun-dong, Dobong-gu. As you can see in the photo below, it is a spacious and clean hospital with excellent facilities for treatments and procedures. It is a friendly hospital that provides good medical care, so there may be some waiting time. Although it may look like a dermatology clinic that only performs skin procedures at first glance, it is a hospital where you can receive treatment for various skin conditions, prescription medications, skin care, and procedures. Sometimes, reviews mention discomfort related to consultations or waiting, but they check all such comments and respond individually. The hospital's focus on medical management and patient care makes it seem even more trustworthy. On weekdays, consultations are available until 6:30 PM, and on Saturdays until 1:30 PM, so visitors may want to keep that in mind.