Board Certified Allergy And Asthma Specialists (For Children & Adults)

Featured in South Shore Magazine

Read the full feature article on page 30 of the Spring 2022 Issue ->


Margaret A. Vallen, M.D.

Margaret A. Vallen, M.D.

Morgan Denno, MSN APRN

Morgan Denno, MSN APRN

Board Certified Family Nurse Practitioner


Dr. Vallen began her clinical career practicing Pulmonary and Critical Care medicine at Boston Medical Center in 1997. Four years later she began practicing Allergy and Immunology at the Beth Israel Deaconess Medical Center-Boston, followed by a transition to private practice on the South Shore where she stayed for 14 years.
She is excited to be opening Vallen Allergy and Asthma, PC in Quincy, MA, as allergist and immunologist where she will continue to provide children and adults with the highest quality care. Dr. Vallen prides herself on thoroughly listening to every patient’s history and forming a detailed work up in order to efficiently diagnose and treat her patients.
We welcome all our patients to be treated at our friendly and compassionate office with well-trained staff.  If you are local to the South Shore, South Coast, and South Eastern MA and looking online for “allergist near me“, please give us a call for an appointment today and start getting much needed relief!
Dr. Vallen enjoys treating all forms of Allergies and also spends part of her clinical time managing the New England Food Allergy Treatment Center-Boston. This office, also located in Quincy MA, is designed to specifically diagnose and treat children and adults with food allergies with a procedure called Oral Immunotherapy (OIT).
For food allergy testing and treatment inquires please contact us today.



Walk-in Hours for Injections are different than Office Hours for Appointments. Please see our regular office hours at the bottom of this page.

  • Monday
    Injections: 9:30 AM – 11:45 AM & 1:00 PM – 4:30 PM
  • Tuesday
    Injections: 1:00 PM – 4:30 PM
  • Wednesday
    Injections: 1:00 PM – 6:45 PM
  • Thursday
    Injections: 9:00 AM – 11:45 AM
  • Friday
    No Injection Hours
  • Saturday - Sunday
    No Injection Hours


Dr. Vallen is truly a one of a kind. From day one she formed a no-nonsense partnership with us that has been instrumental in keeping my child safe. Dr. Vallen is direct in her communication style, having an uncanny knack for communicating with patients as equals- whether the patient is 8 ,18, or 48. Hands down, she is simply THE BEST!

Patient Paula Buckley Software Engineer
Paul BuckleyMilton, MA

“Dr. Vallen is a caring, dedicated and wonderful physician! From our first appointment several years ago to our biweekly visits, Dr. Vallen takes the time to listen, provides high-quality care and shows compassion for me and my family. I am so impressed by her commitment to her patients!
She has always been fully invested in finding the best solution for our allergies and didn’t treat us like just another patient. We are beyond grateful for finding her and couldn’t be happier with our experience.
We highly recommend Dr. Vallen!”

Kara SQuincy MA

Dr Vallen is truly a sincere caring doctor and immunologist who always takes the time to get to know her patients while providing encouragement and confidence throughout the process. She is genuine, kind and her passion is like no other. I will forever be grateful to her for all that she has done for my son Andrew during peanut therapy.

Annie Artist
AnnieSouth Boston, MA

We found Dr. Vallen after searching for a good pediatric allergist on the south shore, and she has been a tremendous help for both our kids that suffer from terrible seasonal allergies.  Our experience with her has been wonderful, and you can tell that she has a passion for what she does and really cares about her patients old or young!

Aisha T.Braintree, MA

Areas We Service

Our office is located in Quincy, MA and we are proud to say that we treat many patients from all surrounding towns including Milton, Weymouth, Braintree, Hingham, Canton, Norwood, Westwood, Dedham, Stoughton, Randolph, Avon, Norwell, Cohasset, Scituate, Hull, Abington, Holbrook, South Boston, Dorchester, Jamaica Plain, West Roxbury, Boston, Medfield, Sharon, Marshfield, Rockland, Hanover, Whitman, Hanson, Pembroke, Brockton, Bridgewater, Kingston, Duxbury, Plymouth, as well as points further south and Cape Cod.

Call today to make an appointment for a consultation to see how we can help relieve your allergy or asthma symptoms today!