Contagious itchy skin with no rash until scratched?

Some thoughts...: Without a picture it's very difficult to diagnose a skin condition, and what you're describing can have many different causes. It could be a mild eczema, a fungal infection, a viral exanthem, a reaction to something you've come in contact with (a new perfume, lotion, soap), bug bites... It's a long list. If otc Hydrocortisone or Benadryl (diphenhydramine) isn't helping, make sure to check in with your doc!