Red spots on the skin can be caused by a variety of factors including skin conditions, allergic reactions, infections, and other underlying health issues. Common causes include acne, allergic reactions such as contact dermatitis or drug rashes, and skin conditions like atopic dermatitis (eczema) and rosacea. Fungal infections such as ringworm and viral infections like chickenpox, measles, and rubella may also produce red spots. Other causes can range from heat rash and cherry angiomas to autoimmune conditions like psoriasis. Tiny red spots known as petechiae result from small bleeding under the skin and can indicate injury or more serious medical conditions. The exact cause often depends on the appearance, location, and accompanying symptoms of the spots, and treatment varies widely from topical creams and antihistamines to antifungal or antibiotic medications. In severe cases, medical attention may be necessary, especially if there are signs of a serious allergic reaction or infection.