Can this happen to my arms if I'm a very heavy computer user?

I lay on my desk all the time on my arms using the keyboard and mouse and sometimes just laying on them I'm a bit chubby anyways and I was wondering my arms look like they are bigger can they swell up at the top? If you lay on them to much I need to get something else to do instead of always on this thing, XD So I was just wondering can that happen, I also lay on my arms at night under neath my pillow can that make them look big?