Im sure you will be fine Sorceress and you will get the all clear again. As Eamonn says most lumps turn out to be non-cancerous anyway or else something totally unrelated. However do make sure you get it checked out anyways, even if its just to get some peace of mind.
Biopsys can be so annoying, i remember when i got my lymphnoid biopsy (lymph nodes in my neck to check for lymphoma), they accidently hit a salivary gland then a blood vessel and had to repeat the biopsy again a week later until they eventually got some cells. I still have a lump just right next to where they took the biopsy funnily enough.
How long ago was your last biopsy and how near is the lump to that location?