I would not be ashamed to ask anyone about it at all. It could be a number of things such as constipation, gas, a muscle. How long have you had it? Is it growing? When you touch it, does it feel like it is "anchored down" or does it move? I would say, if it does get worse, to have it checked, lumps can sometimes be an indicator of something serious, but certainly not all of the time.
I agree. I would probably have it checked. I noticed the same type of lump on my mid side and was a little worried what it was as well. It has been there for about 6 months now and my doc told me it was a fat deposit. Im not overweight at all so I found it kind of strange but she said it was very common and no need to worry about it.
I realy think you should go to your dr, dont be shy that is why we have dr's. Any lump found in any part of your body should be checked.