Weird itchy skin inflammation and spreads! HELP!?

You are describing "giant hives" or "giant urticaria". Of course, telling you what you have doesn't tell you WHY you have it. Hives represent an allergic reaction to something (anything, actually) to which you are allergic and sensitive. It can be something new, or even something old that you've been ingesting or coming in contact with for years. Sometimes, the allergic agent is obvious; other times, it's never found. Treatment is with antihistamines, such as benadryl.