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Meet Our Providers

Dr. Lally

Margaret S. Lally M.D. is an American Board of Dermatology certified dermatologist in private practice since 1989.


Dr. Lally was born in Sharon, PA.  She attended the University of Notre Dame for her undergraduate studies (1977-81) followed by the University of Pittsburgh Medical School (1981-85).

She completed her residency in dermatology at the University of Pittsburgh/UPMC health system in 1985. Her focus is on general pediatric and adult dermatology which includes yearly skin exams, surgical procedures, and the evaluation and treatment of a wide range of skin, hair, and nail concerns.


Dr. Lally has been a member of UMPC St. Margaret medical staff since 1990. As a volunteer with their residency program, Dr. Lally welcomes residents into her office, educating them during their dermatology rotations. She has been named one of Pittsburgh’s Top Docs on multiple occasions.


Dr. Lally and her husband, John Marous are proud parents of 6 children: Carlie, Jack, Molly, Kelly, Dan and Andy. She lives with her family in Fox Chapel. When not working she enjoys all aspects of family life. She also finds pleasure in maintaining good physical and mental health with regular exercise, cooking in healthy ways and vegetable gardening.

Maria Ressler, PA-C

Maria is a physician assistant who has practiced dermatology since 2006. She is a local resident, having attended Fox Chapel High School.  She completed her undergraduate studies at the University of Pittsburgh, graduating magna cum laude.  She was inducted into the Pitt chapter of Phi Beta Kappa Society.  Maria was also a member of Phi Sigma Pi National Honors Fraternity.

After graduating from Pitt, Maria attended Chatham College and received her Master of Physician Assistant Studies degree in 2006.  During her academic career at Chatham, Maria was honored by the Pennsylvania Society of Physician Assistants by taking second place in the organization’s Diversity in Medicine Writing Contest.  Her paper was focused on Huntington’s Disease, genetic testing, and disability.

Maria is a member of the Society of Dermatologic Physician Assistants and the Pennsylvania Dermatology Physician Assistant Society.

Maria is responsible for many services including diagnosing and managing skin diseases, ordering and interpreting laboratory tests, and writing prescriptions.  She also performs many procedures in the office including biopsies, surgeries, and laser treatments.  She is legally and ethically bound to practice dermatology under the supervision of Dr. Lally.

Maria enjoys spending time with her husband, three young children, and two dogs.  They all love cheering on the Pitt Panthers!

Maria Ressler Fox Chapel Dermatology


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Everything went well. Office staff is very friendly!

Leslie M.

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Very courteous and professional.

Stephen G.

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Efficient and thorough.

Eileen M.

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Maria is great, very thorough. Brought Dr. Lally in to double check.

Emily W.

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Went well. All questions and concerns addressed. Very friendly.

Amy P.

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I cannot say enough nice things about Maria Ressler! Not only is she super knowledgeable, efficient, and insightful, but she’s wonderfully personable! Everyone at this office is terrific. Just love them!

Kristine H.

Great and on time.

Jeff K.

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