Hi. We can certainly continue after this if you'd like
Yes, since it's a bacterial skin infection, cellulitis can spread, not only in the area where it first appears, but from, say, one leg to the other.
That said, I'm concerned about another matter here. What's going on in your left leg may not be cellulitis, but rather a deep venous thrombosis--a clot in a leg vein. For that reason I urge you to call your doctor and let him know about this. He may want to see you and get a Doppler venous study of the leg