My arches (bottoms & sides) and inside of both heels start itching to the point that's not tolerable.Once I start scratching I can't stop. I will use anything to stop the itching (finger nails, stiff brushes, chair legs, door jambs, anything hard) and usually break the skin from scratching too hard. Even at that point the itching remains and I can't stop scratching. This happens about every 5-6 days. The itch comes on slowly. I can feel a slight sensation a day or too before it it gets to the point it's intolerable. If I touch the area at this time it seems to speed up the the itching intensity. I have tried Hydrocortizone cream to no avail. Putting it on sometimes brings the itching on because I've rubbed the area. Any suggestions?