Weird breast lumps in other breast

This is an odd one. I finished herceptin last year & I've been meticulous with my Letrazole (it was two small stage 1b invasive ductal cancers, one double + & one also HER-2+).  I've put cream on my breasts every day and not felt any lumps.  I woke up 2 weeks ago with a large, very sore reddish bruise on the other breast.  It felt inflamed, but it was too sore to investigate far.  I left it a few days and the soreness went down but was still there, and there was a lumpy area under it.  I went to the GP, who felt the lump but we agreed to wait a week to see what happened. That night, it got really sore and even more red than before, with a lump 2 inches across.  The redness spread to the other breast for a few days.  It's gone down now, but there's still some slight redness and 2-3 distinct lumps left.  My energy levels are great, which they weren't before my first diagnosis and my dog isn't worried, which she was before.  My GP's referred me back to the hospital.  I'm obviously scared it's back, but very, very confused because it just doesn't seem to make sense that it's the same thing.  I had no symptoms last time apart from a recurrent dull bone-type pain. This was just sore & barely even that now. 

A question, I suppose: has anyone else had this presentation of breast cancer? What specific type of cancer?