I would suggest go to DR Kim , Its located Dushil line number 131  /  Thats subway line 1 stop 31 , Its 3 stops past PNU heading to Pomosa   Go out exit 5 , Go to the Bldg that has Busan Bank , Dr Kim's Skin Clinic is on the 3floor ,  They are open Monday to Saturday ,  Open at 9 30 am , Except Thursday open at 2 pm  They close at 6 pm , Except Sat close at 3 pm