Allergic reactions to eyelash extensions, while unlikely, can occur from time to time. While this can be unpleasant and disappointing, you should be aware of the possibility. Furthermore, it may just be a temporary irritation that you are experiencing. Allergic Reaction or Irritation ? Sometimes mistaken for an allergic reaction---and most common among lash wearers---is a temporary irritation. This includes redness of the eye, itchiness, and tearing of the eye. These symptoms