Red itchy spots on skin can be caused by allergic reactions, contact dermatitis, atopic dermatitis (eczema), scabies, viral infections like chickenpox, psoriasis, or fungal infections such as ringworm.
Depending on the cause, red spots on the skin that itch may also appear with other symptoms, such as fever, body aches, small bumps on the skin, dry or flaky skin, headache, or nausea.
To confirm the diagnosis and receive the right treatment, it is best to see a dermatologist or primary care provider. Any medication should only be used with guidance from a healthcare professional.