Why do photos have red blotches on them?

Red blotches on photos can occur due to various reasons, such as sensor overheating, improper white balance settings, or issues with the camera's image processing. They may also result from the use of low-quality or damaged memory cards. Additionally, red blotches might appear during photo editing if color adjustments are applied incorrectly. Lastly, certain types of lighting, especially fluorescent, can create color casts that manifest as red spots in images.