Hello, You have become sun burnt after exposure to sunlight 2 days ago. From knees down you also have swollen legs, it is starting to become numb. You are pregnant. Water retention, varicose veins, obesity and high blood pressure are common in pregnancy that can cause swelling below the knees. Since your skin is sensitive, avoid exposure to sunlight. Avoid intake of salty food and salty snacks. Avoid sedentary lifestyle, do regular walking in the morning and evening for a short time, Do not exert yourself. You can apply ointment Soframycin in the area affected. it will relief. Since your legs are getting numb, get clinically examined by a gynecologist to rule out insect bite, allergic reactions, varicose veins, hypertension, thyroid dysfunction, etc. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician