The lumps ma have just been swollen lymph nodes, and the CBC would check the white blood cell count, which would indicate an infection. Usually unless the tick has been attached over 24 hours(and by then it would be really bloated and whitish) Lyme disease shouldn't be a problem. Keep an eye out for a bullseye rash, though, and not necessarily right where the bite was. The doc was just trying to be thorough, and checking for an infection, and in that case he will use antibiotics. Your lymph nodes swell when your body is fighting something foreign off.
Hope all turns out well!