Mysterious swelling that flares up a few times a year, with lumps or denser areas which has not been satisfactorily diagnosed. Areas affected would be feet, legs, groin area, hands, arms, back of neck. It looks like an infection since it is red, swollen, sore but no opening in the skin. I think it may be an auto- immune problem. I ve had this now since I was 30 yr. old and am now 58 yr. old. I thought perhaps it could be Sarcoidosis, however chest x-rays do not show abnormal lesions which is usually found with this disease. Sarcoidosis is however difficult to diagnose. Doctors do not seem overly concerned, but if it is Sarcoidosis, that is something that I understand from some sources can be treated with steroidal type medicine. Or it could be something like Sarcoidosis. I would like to get rid of it permanently even though it manifests itself occasionally. First time I got it, it came on suddenly and affected from the knees down. Red slash marks about 1.5 to 2 inches long by about .5 inch wide turned bluish like a bruise and was raised, warm to the touch and painful but denser in the centre. It went away on its own but took a few months. My feet were both very swollen. I get it periodically, seemingly when I m physically and mentally stressed. SDteroidal type cream helps the back of the neck heal.