What causes red rashes on a baby's back?

Red rashes appearing on a baby's back may be caused by various factors. Eczema is one of the common skin conditions, associated with external irritants and the baby's constitution, which can lead to red rashes and itching on the back. Heat rash (miliaria) is another possible cause, especially in hot and humid weather when excessive sweating and blocked sweat glands may trigger the condition. Additionally, viral infections such as roseola infantum may cause red rashes on the baby's back, often accompanied by symptoms like fever. To accurately determine the cause, parents are advised to seek timely medical attention for the baby, undergo professional examinations to identify the underlying cause, and follow the doctor's guidance for targeted treatment. Meanwhile, parents should also ensure the baby's skin remains clean and dry, avoiding overheating and friction to reduce the occurrence of rashes.