Non painful lump on my stomach?

To start at the beginning last year around this time I was taken off of neproxin because it tore the lining of my stomach and ever since then I've had bad stomach problems. I was put on omeprazole to help with it but it didn't always work and a couple weeks ago my doctor sent me to a GI specialist who switched me to another medicine and diagnosed me with IBS however when I asked about this small lump on my stomach that's shaped like an oval and about two fingers long/wide, she didn't say anything. It doesn't hurt but it moves from side to side and it's not hard. Doe's anyone know what it might be?