What would cause a 12 year old female to get rash that itches all over her body?

There are many possible causes of a rash that itches all over the body in a 12-year-old female, including:

* Insect bites or stings: Mosquitoes, fleas, ticks, and other insects can all cause itchy rashes.

* Chickenpox: Chickenpox is a common childhood illness that causes a rash of itchy blisters.

* Measles: Measles is a highly contagious viral infection that causes a fever, cough, runny nose, and a red, itchy rash.

* Rubella: Rubella is a viral infection that is similar to measles, but it is usually milder.

* Scarlet fever: Scarlet fever is a bacterial infection that causes a sore throat, fever, and a red, itchy rash.

* Impetigo: Impetigo is a bacterial skin infection that causes red, itchy sores.

* Eczema: Eczema is a chronic skin condition that causes dry, itchy skin.

* Psoriasis: Psoriasis is a chronic skin condition that causes red, scaly patches of skin.

* Hives: Hives are red, itchy bumps that can appear anywhere on the body.

* Drug allergy: Some medications can cause an allergic reaction that includes a rash.

If your daughter has an itchy rash, it is important to see a doctor to get a diagnosis and treatment. The doctor may recommend over-the-counter or prescription medications to relieve itching, or they may recommend other treatments such as avoiding triggers, using cold compresses, or taking a bath in oatmeal.