<s>[INST] I have extreme pain and swelling and redness in the lower half of my leg they gets some better through the day or after movement. Gets worse when laying down and lessons while standing. There is a new small sore that has open up for no apparent reason. [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. This may be a beginning of leg cellulitis which is inflammation of subcutaneous tissues and may develop into diabetic foot or even diabetic gangrene so any swelling, redness or pain in legs in someone who has diabetes should be evaluated by medical professionals since antibiotics may have to be started as soon as possible to prevent spreading of infection. He should do at least basic blood tests and blood sugar to see if there is significant infection or not. Other causes include deep vein thrombosis or lymph edema and these should be checked with an ultrasound exam. Hope I have answered your query. Let me know if I can assist you further. </s>