Where is the recommended area to test lash glue?

The recommended area to test lash glue is the back of the ear. This area is chosen because it is relatively sensitive, allowing for a better assessment of how the skin reacts to the adhesive. Testing in this location helps to identify any potential allergic reactions or irritations that may occur when the glue is applied near the eyes, which are particularly sensitive.

Using the back of the ear combines accessibility and sensitivity, ensuring that a proper test can be conducted without causing discomfort. The other areas mentioned, while they may be used by some, do not provide the same level of usefulness in evaluating skin reactions in relation to the delicate nature of eyelash application.