Patch test protocol for lash techs: the standard every UK lash artist should be working to

TL;DR: A patch test before a new client's first lash appointment is not optional. It is the professional and insurance standard for treatments applied close to the eye area, and the absence of a documented patch test is the most common gap in lash tech professional conduct disputes and insurance claims. This article sets out what a complete patch test protocol looks like, what to record, what to do when a client wants to skip it, how to handle a reported reaction, and what "no reaction to previous adhesive" does not mean. Allergic reactions to lash adhesive can develop at any point in a client relationship, including after years of uneventful treatment.

Before we begin: no lash adhesive or lash product can be guaranteed "hypoallergenic." That term is not regulated. Products marketed as hypoallergenic still carry reaction risk. A patch test reduces risk. it does not eliminate it. For any significant allergic reaction after a lash treatment, the appropriate instruction to a client is to see their GP, and for any severe reaction (throat tightening, difficulty breathing, significant swelling beyond the immediate eye area), to attend A&E immediately. The patch test protocol in this article is a professional standard for your practice. it is not a guarantee of zero reaction, and it should never be presented as one.