Hi Nikki, there are going to be a lot of choices for facials, so it depends upon your goal:
Example Goals:
Treating yourself to day of wellness and skin boost or pick me (short-term).
Treating some skin trouble spots to make "progress" towards lasting alleviation.
I say "progress" because skin treatments usually need to be continued with follow up sessions. But depending upon the concern and ones budget, some treatment packages / stacks can give good results with only one or two sessions, but usually effective methods are also reflected by their price and can be more aggressive (downtime / recovery time)
In terms of places to get facials in Seoul, they can be organized into 3 categories.
1) Dermatology Clinics
Can perform laser treatments along side facials
Treatments can be medical grade (i.e. intensive)
Cost may be higher
Good for clinical methods that make an lasting improvement, but depends on treatment method chosen.
2) Esthetician Boutiques
Treatments are facials & massages with various masks, serums, clay, steam, etc...
Rejuvenating and noticeable glow immediately after
Price range depending upon small shop vs high-end luxury spot.
Good for general facial treatment for a one-day pick me up / relaxation.
3) Beauty Spas
Beauty & wellness with larger options menu for treatments (face & body).
Usually longer treatment times (2 hours to full day)
Price range depending upon small shop vs high-end luxury spot.
Good for combining relaxation and facial for one-day pick me up / relaxation.