Acne is a disorder of the skin that causes your skin to be spotted by pimples, blackheads, red swellings, or cysts. While it’s most common in teenagers, it can afflict people of all ages.
In most cases pimples are caused by an increase in skin gland activities. This just means that in skin there are hair follicles, and normal, natural skin oil that drains out of a pore or hair follicle gets clogged. The clogged pore forms a blemish called a blackhead as the trapped oil oxidizes, dries out, and then turns black.
If the pore is so clogged that no air gets to it, a whitehead pimple forms. This is just a little infection under the skin, but it can turn into a cyst when germs breed in the backed up oil. It is the cysts that leave a permanent scar. Pimples do not scar unless they are infected by squeezing and picking.