Tender Spot on my under boob??

Lauren

Hi guys!! I have this weird sore spot on my under boob and I have no idea what it is . I went to the doctor and they said they didn’t feel a lump or anything and that I needed to wear a bra for more supper ??? But I have never worn bras and I only have 32b’s so I really don’t need a bunch of support. Anyway I don’t know what it is but it hurts really bad and if I touch it or anything hits it, it’s really sore ... has anyone else had this ??