The sebaceous gland is an oil-producing gland and is connected with follicles -- often called pores. Sebaceous glands can also be found on the eyelids and mucosa, prepuce and cervix, however, they are not connected with pores. The sebaceous gland contains holocrine cells that release sterols called sebum. The sebum, in a form of oil, normally drains out to the surface of our skin. When pores and sebum oil gets blocked for some reasons, then bacteria begins to grow and that causes acne.
Doctors categorized the two most common types of acne:
Whitehead: A white head is formed when sebum and bacteria got blocked deep below the skin surface.
Blackhead: Trapped sebum and bacteria can only partially open to the surface and a visible black enlarged pore -- Not dirt but are dead skin cells and oil.
Tip: Dirt was not the main reason that causes acne, and pores are not just simply got blocked from the top down due to poor hygiene. Below the skin are walls of pores that stick together and clogged, that is the real cause of acne. Hence, frequent wash could irritate pores and cause them to clogged even more.
Papule: If there is a break in the follicular wall then the white blood cells rush in, and the pore becomes inflamed. Usually in the form of pimples that are reddened, tender and swollen.
Pustule: When the body's white cells attacked the plugged pores it cause an inflamed acne lesion. We usually heard people called zit or pimple.
Nodule: A painful inflamed bump formed when pores breaks along the bottom and collapsed.
Cyst: Large pus-filled lesions resulted from severe inflammatory
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