These ingredients are what we call acnegenic or ingredients that cause acne. Check out your skin care products and see if they contain any of these ingredients. If they do, I would highly recommend you discontinue using them.
Fragrance: this is one of the most common ingredients that causes irritation, sensitization, and can further irritate existing acne.
Artificial Colors: these are very comedogenic (causing clogged pores, which could lead to acne) and can be very sensitizing and irritating.
Mineral Oil: this is used in so many products and is know to cause acne.
Lanolin: this ingredient is a fatty substance that comes from sheep'a wool though it is known to have moisturizing properties, it an clog pores and lead to breakouts.