The curing reaction of the glue is accompanied by the generation of volatile substances (irritants), which continue to be generated until the glue is fully cured. (We advise that the full curing time for conventional moisture-curing glues is 30 minutes to 2 hours (depending on the glue)). Compared to conventional moisture-curing glues, Matsukaze LED glue has achieved a significantly shorter complete curing time of 2 seconds when irradiated with LED light. This dramatically reduces the time and total amount of volatile substances (irritants) generated during the curing reaction, and the total amount of volatile substances (irritants) that adhere to the skin and mucous membranes is reduced, which is thought to reduce the risk of allergies. However, switching to Matsukaze LED glue does not guarantee that problems will not occur. If you wish to change the glue, you need to confirm the client's intention and obtain his/her consent at the time of counseling before proceeding with the procedure. I have answered the above without speculation that it is an allergic reaction to an ingredient. Only a physician can make a medical judgment regarding allergic sensitization to glue ingredients, so if you have any doubts, please be sure to consult a medical specialist (dermatologist or ophthalmologist).