Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Rashes ?
    ### Response:
    A rash is an area of irritated or swollen skin. Many rashes are itchy, red, painful, and irritated. Some rashes can also lead to blisters or patches of raw skin. Rashes are a symptom of many different medical problems. Other causes include irritating substances and allergies.
    