What could an itchy red rash on your arms chest back and legs be if not ever suffered from eczema?

Hives (urticaria): Hives are raised, itchy, red or skin-colored welts that can appear anywhere on the body. They can be caused by an allergic reaction to foods, medications, insect bites, or other triggers.

Contact dermatitis: Contact dermatitis is a skin condition that occurs when your skin comes into contact with an irritant or allergen. It can cause itchy, red rashes, blisters, and swelling. Some common causes of contact dermatitis include poison ivy, poison oak, laundry detergent, and jewelry.

Scabies: Scabies is a contagious skin condition caused by tiny mites that burrow under the skin. It can cause intense itching, especially at night. Scabies rashes are often found on the wrists, elbows, armpits, and between the fingers and toes.

Psoriasis: Psoriasis is a chronic skin condition that causes red, scaly patches of skin. It can affect any part of the body, including the arms, chest, back, and legs.

Ringworm: Ringworm is a fungal infection that can cause itchy, red rashes in a ring shape. It can affect any part of the body, but it is most commonly found on the scalp, neck, and arms.

Drug reactions: Certain medications, such as penicillin and sulfonamides, can cause allergic reactions that can lead to the appearance of an itchy, red rash on the arms, chest, back, and legs.