I developed a rash on my lower legs, and have had it since Tuesday evening. I have been taking Benadryl at night, and it disappears, then by the next day in the afternoon it reappears. It itches really bad, and the spots are getting bigger and are getting larger by the day. The rash is NOT raised, but under the skin. it has been just below the knee to my ankle, but is going above my knee a bit and a little on my feet.