by Louisa Agate, LMA Acne is a chronic inflammatory skin condition that causes spots, pimples, blackheads especially on the face, shoulders, back, neck, chest and upper arms. Whiteheads, blackheads, pimples, cysts and nodules are all forms as acne vulgaris. A long-term skin condition that occurs when dead skin cells and oil from the skin clog hair follicles. Genetics is the …