What potential side effect can occur from improper lash extension application?

Traction alopecia is a potential side effect that can occur from improper lash extension application due to the stress it puts on the natural lashes and the hair follicles. When lash extensions are applied too heavy or are improperly attached, they can place excessive weight on the natural lashes, which may lead to damage and eventual shedding of these lashes. Over time, this can affect the hair follicles, resulting in traction alopecia, where the hair thins or falls out.

This side effect highlights the importance of proper technique and adherence to guidelines during the application process. Adequate training and understanding of the limitations of natural lash hair are crucial for preventing such complications and ensuring the health and safety of the client's eyelashes.

While other options like allergic reactions and bacterial infections can certainly occur in the context of lash extensions, they do not specifically relate to the mechanical stress caused by improper application as traction alopecia does. Color fading is not relevant to lash extension application, as it pertains more to hair dye rather than the health of eyelash follicles.