What is a common symptom indicating irritation or allergy to eyelash extensions?

Itching and redness are hallmark symptoms that indicate irritation or an allergic reaction to eyelash extensions. These symptoms arise when the individual's skin or eyes responds negatively to the materials used in the extensions, such as the adhesive or even the synthetic fibers of the lashes themselves. When irritation occurs, the body's immune response may trigger these symptoms as a way of signaling distress.

In contrast, improved vision, hearing issues, and increased lash growth do not align with common reactions to eyelash extensions. Improved vision is unrelated to eyelash application, while hearing issues can stem from entirely different causes not connected with the use of eyelash extensions. Increased lash growth typically is not a direct outcome of applying eyelash extensions, as extensions are meant to enhance the appearance of natural lashes rather than promote their growth. Thus, the presence of itching and redness serves as a crucial warning sign that should prompt further examination or action to address the potential irritation or allergy.