Can lipomas grow overnight?

I was lifting some bags grabbing a hold of them with my arm and I felt some pain. Similar to a bruise. Then I noticed a small lump on my inner arm. The next day the lump seems to have grown and it's become a very visible bump. I had a routine appointment with my gynecologist today (had nothing to do with the lipoma) and she said it looks like one. Is the pain normal and especially the fact that it appeared so fast?