How long should i monitor a red breast rash before seeing a doctor?

[WitBeyondMeasure]

Hey folks!
So, yesterday morning I noticed a red area on my breast about the size of a twenty pence piece.
I took a photo yesterday and one today to see if it changes. It's making me rather anxious and I would like to see the doctor about it BUT there is a significant chance that it could be an accidental hickey 🙈
I asked my husband and he said if it was him it was entirely unintentional of course!

In that circumstance, how long would you monitor it before seeing a doctor?
I'm in my early 30s if that makes any difference.

And I'm not breastfeeding. Haven't for almost two years.

Well, a bruise should change colour after a couple of days, I'd give it a till tomorrow and then if no positive change or gets worse I'd see a GP (or maybe just a nurse appointment if you can't get a timely gp app?).

Does it feel different as well as look different? If it does please go and see your GP no matter what.

@nrpmum it doesn't feel any different that I can tell.