My husband has developed red itcy blotches just below both knees on the shins and they have spread to the side of his leg below the knees as well, no where else. What is causing these red itcy blotches which are spreading , but again, just below both knees on the shins? Thank you for any advice? My husband is not allergic to anything that we know of but is under a lot of stress. The red blotches are not raised, they are very flat, just a red itchy rash. My husband is 59, non smoker and 190 lbs, five foot ten,