Allergic reactions following eyelash extensions are often caused by multiple factors, including material composition, application techniques, individual differences, and aftercare. Below is a detailed breakdown of common causes: Chemical Components in the Adhesive 2.Additives (e.g., Formaldehyde, Phenol) Low-quality adhesives may contain harmful additives like formaldehyde or phenol, which can cause contact dermatitis or allergic conjunctivitis.…