The PSM100 Hydrocolloid Pimple Acne Patch is made of high absorbent hydrocolloid material, which can absorb acne secretion. When you use it on your pimple, this translucent plaster will always stay the same color as your skin to make the plaster invisible. The hydrocolloid material can moisturize the skin and help the pimple to recover faster. Yes, you can easily wear it outside for the whole day as it is transparent, breathable, and hides under make-up. No, the pimple patch absorbs pus and impurities and leaves no marks or scars. You should use it for active acne when the white head is visible. The healing process depends on pimple size. Smaller acne's might heal overnight whereas bigger acne's will diminish and heal over time.