It's not in Pattaya, but not far, and I personally wouldn't go anywhere else:
Back in 2015 I had a pre-melanoma mole removed on my back. It was diagnosed in America, but since I was going to Thailand in a few weeks I decided to take care of it in Thailand. I went to the government university hospital, "The Institute of Dermatology" in Bangkok. Google map link:
https://maps.app.goo.gl/3kwYb9wTV82KSSBK9
I arrived at 6:00 when they opened. I registered.
I saw a doctor at 11:00.
I was in surgery at 13:00 (after lunch).
I paid and was out the door before 15:00.
I was incredibly impressed with everything. The cost at the time: $12. And this included all the lab work to make sure they cut deep enough (they tested what they removed). This might sound like a long day, but had I taken care of this in America it would have been a half dozen appointments spread out over 6-8 weeks and hundreds of dollars in insurance copays. Today I expect the total cost would be under $50.
Since this experience I've learned university hospitals are the way to go. They're government hospitals, so cheaper - yet in my experience a much better quality of care.
I'm not in Thailand at the moment, but when I return next year I will go there for a full body skin exam.
- Thomas
P.S. Additionally, the "Thai Travel Clinic" is right next door. In my opinion it's the best place to get low cost vaccines in all of Thailand.