I have been experiencing occasional itchiness on my hands. It starts with tender bumps on my hands or fingers, when they itch it it is hard not to stop. After the itching calms down I will get a reddish blister in the area where it was itching. The only thing that has changed since this started is I have been using Flonase (actually a generic brand) for allergies. It only happens on my hands. Thoughts on what this could be?