Two weeks ago I woke up with a sore breast. I assumed I slept funny. The next day every step I took it was sore. The day after a pink rash (like a heat rash) covered my breast. It lasted about 4 days and then went away and have had no pain or rash. I am now obsessed with looking and in some lights I can see a slightly darker patch above my breast but only in darker lights. My question really is if it was cancer would the pain and redness go? I wonder if the slight change of skin colour is just the after mare of the rash. It’s just a small match and not noticeable unless I pointed it out. I have a habit of putting clean dog poo bags down my bra when I go for a dog walk and wonder if that coukd have irritated it.