It is not possible to know what your breast change is and I sense you are very worried about what you have noticed.
Noticing a change doesn’t necessarily mean you have breast cancer and most breast changes are not because of cancer they can be due to benign conditions (not cancer) . But it’s important to get checked by your GP when you notice new changes.
I noticed this red mark yesterday on my left breast and I am freaking out. It doesn't hurt, but it is somewhat itchy. It doesnt seem like a bug bite to me though. I'm worried it might be IBC. I have been putting Neosporin and hydrocortisone cream on it. Does this look like anything worrying to anyone??