What Could Cause A Red Blotchy Rash?

What Could Cause A Red Blotchy Rash? Skin rashes can occur from a variety of factors, including infections, heat, allergens, immune system disorders and medications. One of the most common skin disorders that causes a rash is atopic dermatitis (ay-TOP-ik dur-muh-TI-tis), also known as eczema. What does a blotchy rash mean? Allergies. Skin changes like