Institute of Dermatology, Rajavithi Hospital.
It is a couple of hundred metres from Victory Monument skytrain station.
It is a public hospital but do not be deterred by that. The building which is some fifteen stories tall is solely dedicated to dermatology and it is new as in everything in it. It makes Bumrungrad look a bit shabby.
Excellent doctors and consultants. Short surgery wait times.
I have used this hospital since about 2007 since they were in the old building next door and I recommend it.