A stye is a red, painful bump that forms near the edge of the eyelid, typically caused by a bacterial infection. These infections can occur from factors such as sharing eye makeup products (e.g., mascara or eyeshadow). Styes may develop externally, appearing along the lash line as a pimple-like bump, or internally, forming inside the eyelid where they may be more difficult to see. Symptoms can include light sensitivity, a scratchy or foreign-body sensation, redness, and eyelid tenderness. If you notice a bump on your eyelid that resembles a stye, it is important to visit your eye doctor for proper evaluation and treatment. Prompt care can help ensure safe, effective management and quicker relief from discomfort.