As more people receive COVID-19 vaccines, more is being learned about their side effects.

Yale Radiologist Dr. Regina Hooley told News 12 that some of the glands or lymph nodes in the armpit swell after receiving the vaccine, and that it could sometimes be mistaken as a sign of breast cancer.

She says technicians are aware of the reaction now and will take recent vaccinations into account upon visits.

Dr. Hooley says the risks of waiting for your mammogram just aren't worth it.

"Many women have deferred their mammogram already because of the pandemic,” she says.

Some who got the Moderna vaccine have reported red and swollen arms that don't show up until a week after the shot.

Yale Dermatologist Dr. Alicia Little says the rash is safe and fades after around five days.

Doctors say the delayed side effects are no cause for concern and they certainly shouldn't keep people from getting a shot in the arm.

"Might be a little inconvenience, but it's a small price to pay for being protected from coronavirus," says Dr. Little.

Gov. Ned Lamont announced that all Connecticut residents over age 16 are eligible for vaccination starting April 1.