Henna is a beautiful and ancient stain that can be applied to the skin for up four weeks. However, some types contain para-phenylenediamine (PPE), which could damage your natural beauty as well as cause an adverse reaction in some people, such as blisters or scarring! You should also avoid black henna if you’re pregnant because it likely will have harmful side effects on developing baby’s organs when they grow into adults someday down the line – so don’t let this happen by following simple precautions like wearing sterile gloves while doing artwork made from these materials.”