Gakne: is caused by smoking crystal meth and is not the result of picking. Gakne vulgaris (or cystic gakne) is a common human skin disease among gak smokers, characterized by areas of skin with seborrhea (scaly red skin), comedones (blackheads and whiteheads), papules (pinheads), pustules (pimples), Nodules (large papules) and possibly scarring. Gakne affects mostly skin with the densest population of sebaceous follicles; these areas include the face, the upper part of the chest, and the back. Severe gakne is inflammatory, but gakne can also manifest in noninflammatory forms. The lesions are caused by changes in pilosebaceous units, skin structures consisting of a hair follicle and its associated sebaceous gland, changes that require androgen stimulation.