Wow, ladies, I'm glad to have found this thread, too. I'm 37 and have dealt with this itchy arm
at least 7-8 years. Of note---my oldest son is about to turn 8 this November. Not sure if there's a correlation. Also, I initially thought mine was seasonal, too, but I'm not sure it is. I used to live in Virginia and now live in San Diego...and it's bothered me year-round in both locations.