"i live in florida.  this gel worked very nicely for my tennis elbow, shoulder pain and lower back pain. however, i just had an &quot;ah ha&quot; moment as to the mysterious, very itchy rash i have developed. the application areas reacted in the intense heat. last summer while gardening i developed a severe lower back rash which i  assumed was somehow sweat related. this year i developed the same painful, itchy rash on my right upper back (deltoid area and shoulder) down to my lower arm. again, i thought it was from the heat and sweat. as i was applying it yesterday, i realized it was being applied directly on top of my rash. the only  places i have my rash. it took me long enough!! however, i did not get this rash in the cooler temps."