Hi @Newgrandma .... sorry to see you join us here .... I would suggest that you contact your Breast Care Nurse today, who may be able to see you asap to make sure it is not just a stitch popping to the surface (it happened to me.) She could also set up a prompt appointment with your surgeon if she feels you need it .... it may need a biopsy.
I had some 'stuff' under my nipple after my surgery (found in my MG/US the following year) & it turned out to be fat necrosis - and the biopsy confirmed that it wasn't a concern.
In the mean time, feel free to jump onto this thread that has a lot of info on many BC related things, including some Tick Sheets on your mental and physical recovery, to take with you to your appointments, as sometimes it is easier to show them a written 'report' than to talk about it xx
https://onlinenetwork.bcna.org.au/discussion/23477/a-big-welcome-to-all-new-online-network-members#latesttake care xx