When it comes to autumn and winter, the calf is swollen.

I don't know how you got swollen. If it is caused by walking or sitting for a long time, it is nothing. This is called physiological swelling, and it will reduce the swelling after a short rest. If it is not the above two situations, it may be that there is something wrong with the heart and the venous return is not smooth. It is also possible that the weather is cold in autumn and winter, blood vessels contract a little, and blood circulation is not good, so try not to exercise outdoors, and do some exercise indoors, because drought will promote blood circulation, but I still think you should go to the hospital to see a doctor.