What Causes Itching On Calf?

My calf's and only them itch, it gets so bad I scratch until they bleed. Ive changed diets and exercise so I know thats not the issue. Ive used tons of itch relief creams, moisturies, tried different detergents and shower gels. I've tried everything to stop it. The only thing that slightly works is ice packs but thats not always possible and only works for a short periods. It used to happen infrequently but not its everyday. I dont have a rash, just itching and small red bumps.