If I have a super-itchy rash, might I have scabies or possibly something else?

Itchy rash. Itchy rashes can be caused by a wide variety of diseases and conditions, such as infection, inflammation, allergic reaction, parasite and insect bites, and autoimmune processes. For example, a small localized itchy rash may be caused by contact dermatitis due to contact with an irritant or allergen.  a itchy rash that covers large parts of the body may be due to a viral infection or scabies.
Many possibilities. There are many types and causes of skin rashes. Several types of inflammatory conditions of the skin, allergic reactions, and sometimes bacterial, viral or fungal infections can cause rashes on the skin. Insect bites can also be the cause of a rash on the skin. Have it evaluated by a professional and get the appropriate treatment.