Blemishes are chronic skin conditions that are characterized by blackheads, whiteheads, and comedones. Usually they are a small oily mass plugging the outlet of a skin gland.
Blackheads are small oily mass plugging the outlet of a skin gland. They look like small black/dark spots on the surface of the nose, forehead, chin, and face. Bacteria's on the surface of the skin produce chemicals that can cause the wall of the follicle to break. When the wall of the follicle is broken, sebum, bacteria and shed skin cells escape. This is the process by which pimples and large bumps are formed. The blackness of a blackhead is not dirt, but is due mostly to dried oil and shed skin cells in the openings of the hair follicles. To avoid nicking pimples, shave as lightly as possible. Shave only when necessary and always use a sharp blade.
Comedones: are relatively big sized, deeper located oily masses, plugging the outlet of a skin gland and they are often inflamed.
As discussed before it is essential that you do not pick, scratch, pop or squeeze pimples and do not attempt to remove blackheads and whiteheads yourself as this may exacerbate the inflammation and you could potentially introduce additional bacterial infections into a condition that could otherwise be potentially under control. You should only allow a dermatologist to open pimples or remove blackheads and whiteheads. When the pimples are squeezed, more redness, swelling, inflammation and scarring may result.