Mark W. Sornson, MD, PhD, practices dermatology at Sharp Rees-Stealy Santee after earning both his medical doctorate and doctoral degree from UC San Diego School of Medicine and completing a dermatology residency at Stanford Health Care. His clinical range on Cuyamaca Street covers pediatric eczema through geriatric skin cancer surveillance, with cosmetic and medical-grade skin assessments coordinated alongside Studio Mars Spa in the same Cuyamaca corridor. He became the first dermatologist in Sharp HealthCare's history to receive 100 Guardian Angel recognitions from patients, a milestone reflecting sustained clinical relationships across Santee's East County population. Diagnostic evaluations frequently involve collaboration with audiologic screening at Superior Ear Works on Cuyamaca Street when lesions present in the auricular and periauricular regions. Highest-acuity cases include staged excision of morpheaform basal cell carcinomas with perineural invasion, requiring serial frozen sections and complex interpolation flap closures.