Hydrocolloid was originally designed for use as a medical bandage or dressing for wounds. It has a gel layer that’s formulated with pectin or gelatin and other ingredients that attract water and absorb fluids (such as pus). Mighty Patch is not made with gelatin and therefore is vegan-friendly. As the hydrocolloid draws in fluids or pus, the patch changes from transparent to opaque white, which is all the gunk that was pulled from the pimple. Read more about hydrocolloid and how it works here.