Makeup products are the perfect breeding ground for bacteria and can invite a lot of skin problems and other infections like acne stye conjunctivitis cold sores and others. You can get herpes as well. Dr Apratim Goel dermatologist and laser surgeon Director Cutis skin studio Mumbai tells us why we shouldn't share cosmetics. If someone with herpes uses a lipstick and then you use it immediately afterwards then there is a chance of the infection spreading to you. Do not share your makeup brushes or beauty blenders with anyone as it can aggravate your existing acne. Cold sores warts acne and many more