What are Pimples? Pimple is a type of acne that results from blocked pores, which may be due to excess production of oil (sebum), dead skin cells, and bacteria, getting trapped in the pores of the skin. Acne is a long term condition of skin involving oil glands at the base of a hair follicle that can cause many non-inflammatory and inflammatory skin lesions, such as pimples, whiteheads, blackheads, pustules, cysts, etc. Causes / Triggers / Risk Factors of Acne Certain triggers are reported to cause Acne . Puberty is the most common trigger Stress Lack of sleep or sleep Irregularities Hormonal changes Inadequate water intake Genetic Susceptibility Certain Medications such as Steroids Dandruff can cause pimples on forehead Humidity and excessive sweating Harsh Environment: Pollution, Aggressive skincare products, toxins, ultraviolet rays Smoking and alcohol consumption Diet: Dark chocolates , food containing high sugar content or sweets and excessive use of milk products may worsen