Those small red marks can come from many different causes, and context matters. Cherry angiomas are bright red, dome-shaped bumps made of tiny blood vessels; they’re common with age and usually harmless, though they may bleed if scratched. Petechiae, by contrast, are flat red or purple dots under the skin that don’t fade when pressed and can be linked to infections, clotting issues, or medication side effects, especially if they appear suddenly.

Other times, the cause is irritation or allergy, as in eczema or contact dermatitis, which bring itching, dryness, and redness triggered by products, fabrics, or foods. Heat rash and keratosis pilaris add to the confusion with harmless but frustrating bumps. The real red flag is change: spots spreading quickly, not fading, or appearing with fever, fatigue, or sore throat. In those moments, waiting is the real risk—getting medical advice is not overreacting, it’s protection.