I m 25yrs unmarried girl and i have been experiencing pain in my left breast corner under my left armpit for about 1 week or more. the pain is so sevior that i can't even touch it. some times i feel like my nipple is getting numb too, but there is no sign of change in colour or shape of the same. a tiny pimple like thing is appearing on some distance apart from the prone area but it doesn't hurts. I also experience back pain occasionally. i also experience itching where pain occurs. plz help.