<s>[INST] Hello, I am 15 weeks pregnant. About two weeks ago I noticed a golf ball size or little smaller lump/knot on my shin under knee . It had fever on it for few days. And now I also have swollen. Feet, ankles, and its painful. The knot feels like a bone hard. What could this be? [/INST] Hello and welcome to Chat Doctor, A lump on the shin associated with fever, swollen feet and painful ankles suggest infection. I am of the opinion that there is some kind of infection / inflammation in the veins of the lower limbs. Pregnancy predisposes to clotting in lower limb and there is increased probability of infection of the blood vessels called thrombophelebitis. I suggest you to consult your gynecologist first and then your surgeon for clinical assessment and then management. Thanks and take care Chat Doctor.  </s>