George Cotsarelis, MD
Dermatology
Sees patients age 18 and up
Penn Dermatology Radnor
View 1 additional location
Schedule onlineCall 610-902-2400
Headshot of George Cotsarelis, MD
Penn Medicine Provider

About me

  • Chair, Department of Dermatology
  • Milton Bixler Hartzell Professor of Dermatology

Education and training

  • Medical School: University of Pennsylvania School of Medicine
  • Residency: Geisinger Community Medical Center
  • Residency: University of Pennsylvania Health System
  • Fellowship: University of Pennsylvania Health System

What my patients think about me

Average Rating

162 reviews

Comments are submitted by patients and reflect their views and opinions. The comments are not endorsed by and do not necessarily reflect the views of Penn Medicine.

February 2026
efficient and kind
February 2026
he answered all my questions very clear so for me to understand
February 2026
he is very knowledgeable in this field. and has a great reputation.
February 2026
very pleased

Insurance accepted

My Locations

Penn Medicine hospital privileges

  • Hospital of the University of Pennsylvania: Has privileges to treat patients in the hospital.
  • Pennsylvania Hospital: Has privileges to treat patients in the hospital.
  • Penn Presbyterian Medical Center: Has privileges to treat patients in the hospital.
Dr. Cotsarelis is a Penn Medicine physician.

Qualifications and experience

Treatments and Conditions

My research

Garza LA, Yang CC, Zhao T, Blatt HB, Lee M, He H, Stanton DC, Carrasco L, Spiegel JH, Tobias JW, Cotsarelis G Bald scalp in men with androgenetic alopecia retains hair follicle stem cells but lacks CD200-rich and CD34-positive hair follicle progenitor cells , J Clin Invest, 121(2): 2011,613-22

Ito M, Yang Z, Andl T, Cui C, Kim N, Millar SE, Cotsarelis G Wnt-dependent de novo hair follicle regeneration in adult mouse skin after wounding , Nature, 447(7142): 2007,316-21

Fan C, Luedtke MA, Prouty SM, Burrows M, Kollias N, Cotsarelis G Characterization and quantification of wound-induced hair follicle neogenesis using in vivo confocal scanning laser microscopy , Skin Research and Technology, 17(4): 2011,387-97

Ito M, Liu Y, Yang Z, Nguyen J, Liang F, Morris R, Cotsarelis G Stem cells in the hair follicle bulge contribute to wound repair but not to homeostasis of the epidermis , Nature Medicine, 11(12): 2005,1351-4

Morris R, Liu Y, Marles L, Yang Z, Trempus C, Li S, Lin J, Sawicki J, Cotsarelis G Capturing and profiling hair follicle stem cells , Nature Biotechnology , 22(4): 2004,411-17

Trempus CS, Dang H, Humble MM, Wei SJ, Gerdes MJ, Morris RJ, Bortner CD, Cotsarelis G, Tennant RW Comprehensive Microarray Transcriptome Profiling of CD34-Enriched Mouse Keratinocyte Stem Cells , J Invest Dermatol, 127(12): 2007,2904-7

Trempus CS, Morris RJ, Ehinger M, Elmore A, Bortner CD, Ito M, Cotsarelis G, Nijhof JG, Peckham J, Flagler N, Kissling G, Humble MM, King LC, Adams LD, Desai D, Amin S, Tennant RW CD34 expression by hair follicle stem cells is required for skin tumor development in mice , Cancer Res, 67(9): 2007,4173-81

Endo M, Zoltick PW, Peranteau WH, Radu A, Muvarak N, Ito M, Yang Z, Cotsarelis G, Flake AW Efficient in vivo targeting of epidermal stem cells by early gestational intraamniotic injection of lentiviral vector driven by the keratin 5 promoter , Mol Ther, 16(1): 2008,131-7

Lyle S, Christofidou-Solomidou M, Liu Y, Elder D, Albelda S, Cotsarelis G The C8/144B monoclonal antibody recognizes cytokeratin 15 and defines the location of human hair follicle stem cells , J Cell Science, 111(21): 1998,3179-88

Kantor J, Jay L, Brooks D, Cotsarelis G Decreased serum ferritin is associated with alopecia in women , J Invest Dermatol, 121(5): 2003,985-8