Any dermatologist can identify acne and do vanity fillers. Who do you go to for the "mystery" lumps, discolorations, bumps and scaley stuff that scares and embarrasses you? Dr. Yun, if you are lucky enough to get an appointment before you lose your sanity. She's worth the wait.Over the course of a year no doctor could diagnose me at UCLA, USC, Cedars or in private practice. I saw the best in every specialty, including dermatology and pathology. I saw some kind of doctor almost every day. My tumors kept growing in number and size, as did my fear and pain. Dr. Yun diagnosed my rare disease on the first visit and did the confirming pathology work herself. After she figured it out, a dozen of those mystified $1000 a "first visit" doctors agreed she was right and the rest said they had never heard of it. She's a scientist- not just a cosmetic dermatologist. Stop looking and start dialing for an appointment. You'll be in great hands soon....BTW, she's not just smart, she's one of the nicest doctors I've ever had the pleasure of meeting. She goes out of her way to provide answers to difficult questions and she delivers bad news with all the kindness and compassion possible. She recommends the best course of treatment for you, even if it is not offered within her practice. If you have a complicated or undiagnosed dermatology issue, this super-smart, compassionate doc will be your hero, too.I would like to ask reviewers to pay attention when they lower an individual physician's rating because the large medical corporation employees screw up appointments or are unprofessional in any way. Berate the large corporation and rate the doctor in separate reviews. In this case, Dr Yun is a salaried employee of Regal Medical. This is not Dr Yun's private practice. She has no say in how the office is run. I'm defending her because she is a 5 and one of the finest doctors I have ever dealt with in my life. Dr Yun is awesome. Regal is another issue altogether. Please write and rate accordingly. I see this mistake frequently. Do you want to be publicly trashed because the janitor didn't clean the toilets where you work? When UCLA loses your medical records do you shame your doctor or UCLA? You get my drift.Thank you, Dr Yun, for two plus years of exceptional help. You are my derm for life. More