Semi-permanent eyelashes are lash extensions that are applied directly onto your existing eyelashes. This is different to strip lashes. These are easily applied and removed without the need for an eyelash expert to be present.
With semi permanant eyelashes, just one individual lash is applied to one natural lash. The glue that is used to adhere the fake lash to the real one has been specially formulated, so it does not damage the lash or irritate your eyes. It is possible that you could be allergic to a specific glue, but there are different glues available to counter this problem.