Some. There are some people who don't have pain with gout. That doesn't mean that the process is not damaging joints and it should still be managed.
Get an exam. Gout is usually a painful condition where the joint gets hot, red and painful. The only way to tell is to get an examination and probably blood work. If swelling is constant then a sample of the joint fluid may be necessary at well as x-rays to examine the bone.
Gout is painful. If you having swelling in the left foot that is not tender, red, or warm you need to see a physician to rule out other casues of swlling, such as fluid retention or blood clot to name two possibiities. All gout patient's I have seen are in fairly severe pain.
What to do if I have what appears to be a gout on my left foot, but it never hurt. What do I do with it?
Maybe nothing. If there is no pain or deformity leave it alone. If concerned see a podiatrist for a check up.