I HAve A Small LUMP UNDER MY ARM Pit ,

I HAve A small LUMP UNDER MY ARM pit , just UNDER THE SKINTHAT WHEN i SQUEEZED IT was painful and CAUSED A LARGE INFLAMATION above the skinTHAT LASTED ABOUT 2 WEEKS. iT LOOKED LIKE A CYST on the SKIN under my arm pit, BUT NEVER DRAINED OR WAS FILLED WITH ANYTHING AND JUST WENT AWAY. tHE LUMP UNDER MY SKIN REMAINED. i WENT TO MY DOCTOR WHO DID NOT SEEM CONCERNED ABOUT THE LUMP BUT STATED i SHOULD GET A MAMOGRAM SINCE iM OVER 50. i HAD ONE AND NOW THEY ARE ASKING ME TO HAVE ANOTHER ONE AND A ULTRA SOUND. iM SO WORRIED. Does this mean they found cancer?