Lake Washington Dermatology has four providers on staff. Sean McGuire MD is board-certified in dermatology also specializing in Mohs micrographic surgery and cosmetic dermatology for men. Dr McGuire joined Lake Washington Dermatology in August 2018. Dr McGuire is available for new patient appointments. Melissa A Prasatik PA-C is a certified physician assistant under Dr Susan Kim's supervision with nine years of dermatology experience and joined Lake Washington Dermatology in January 2018 after trainnig with Dr Kim for six months. Melissa is also available for new patient appointments. Tiffany Yim PA-C is a certified physician assistant under Dr Susan Kim's supervision currently specializing in acne and wart treatments. Susan H Kim MD is board-certified in dermatology and started the practice in 1999.

  • Dr
    Sean T McGuire MD
    Board-certified Dermatologist, Mohs Surgeon

    Dr McGuire is board-certified in both dermatology and also trained as a Mohs surgeon. Dr McGuire joined Lake Washington Dermatology in August 2018. Read More »

  • Melissa A Prasatik PA-C
    Certified Physician Assistant 

    Melissa is a board-certified physician assistant (NCCPA 1070901) with over eight years of dermatology experience. Melissa began training at Lake Washington Dermatology in July 2017 and has been seeing patients on Tuesdays and Fridays since January 2018! Read More»

  • Janie M Leonhardt MD
    Board-certified Dermatologist, Mohs Surgeon 

    Dr Leonhardt is board-certified in dermatology and also trained as a Mohs surgeon. She performs Mohs surgery at Lake Washington Dermatology in addition to seeing patients in her own clinical practice. Dr Leonhardt joined Lake Washington Dermatology in 2014. Read More »

  • ​Susan H Kim MD
    Board-certified Dermatologist 

    Dr Kim is board-certified in dermatology. Dr Kim started Lake Washingon Dermatology in 1999 and moved the practice to its current location for expansion in 2012. Read More »

  • Kristen Flores
    Master Aesthetician 

    Kristen is a Master Medical Aesthetician and Laser Technician. Kristen graduated from the Euro Institute in 2012, where she became educated in a comprehensive European aesthetic program. She continued her education by attending a medical aesthetic course at the Euro Institute as well as attending a laser certification program at the Northwest Laser Institute, where she became certified as a laser safety officer. Prior to joining the team at Lake Washington Dermatology, Kristen worked as a laser technician for a clinic in Bellevue, gaining a wide range of service knowledge and experience. Kristen has a sound understanding that each client requires a different technique, set of product recommendations, and procedure for each individual skin concern. Through Kristen's own skin struggles and concerns, she feels empathy and passion for helping others achieve better skin. Kristen has a specific interest in treating clients who have sun-damaged skin. She strongly believes that the best cosmetic is great-looking skin. In her free time, she enjoys continuing her education in nutrition, health and wellness.

  • Tiffany Yim
    Certified Physician Assistant

    Tiffany is a board-certified physician assistant who joined Lake Washington Dermatology with nine years of prior experience in plastic and reconstructive surgery. Pursuing her passion for dermatology, Tiffany trained for 18 months at Lake Washington Dermatology before opening her clinic. Tiffany graduated from the University of Portland and went on to attend Western University of Health Sciences, where she graduated with top honors and earned a Master of Science Degree in Physician Assistant Studies. While at Western U, Tiffany received several awards for both academic performance and service to the community. 

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8:00 am-4:30 PM


8:00 am-4:30 PM


8:00 am-4:30 PM


8:00 am-4:30 PM