how to do patch test for face serum

Ever feel like your skin is playing a cruel game of hide-and-seek with itchy rashes and mystery patches? You slather on creams, switch routines, and maybe even resort to googling “unexplained skin bumps near elbow, help?!” Feeling lost in the labyrinth of potential culprits? Step aside, detective creams and lotions, because there’s a skincare investigator…