The most widely used cosmetic ingredient is water.  It is almost always listed first on an ingredient label because it is usually the ingredient with the highest concentration.  Some companies will tell you that water is an inactive ingredient and that it has no purpose and that...

Malassezia folliculitis is a yeast overgrowth in the hair follicle.  The old school name for it is pityrosporum folliculitis. It’s an “acne look-alike” with tiny red papules and superficial pustules that can itch like crazy. Factors can include oily skin, hot, humid...