Is the Covid vaccine actually making people's boobs bigger?

A number of people have claimed their boobs have gotten bigger since they received the Covid vaccine. Is it a conspiracy, or is it a real side effect?

Which arm gets the Covid-19 booster may make a difference, study

How mRNA Vaccines Might Help Treat Cancer - NCI

COVID-19 and Breastfeeding, Breastfeeding

Frontiers COVID-19 Vaccination in Pregnancy and Lactation

KFF COVID-19 Vaccine Monitor: July 2021

Small Breast Sizes Are Also at Risk of Breast Cancer

Women and the Covid-19 Vaccine: What You Need to Know - The New

Living with bigger boobs made me want to hide

COVID-19 Vaccines and People with Cancer - NCI

Pregnant and Breastfeeding Women May Opt to Receive the Vaccine

COVID-19 Vaccine Safety and Side Effects: Important Information

Cancer and COVID-19

Grateful to be alive: Vicky Phelan enjoys girls' weekend with daughter & best friend

Is the COVID-19 Vaccine Safe? Short- and Long-Term Effects