Acne is commonly called as " the youth small pox ", it is a kind of chronic inflammation in the sebaceous glands of hair follicle. It is about 15 years old that appear most frequently but perhaps it begins to appear at 9 years old, and will usually last to more than 20 years old.
Acne easily occurs frequently in sebaceous glands, and the most usual and most dynamic position is like face, chest, back. It can be shown in many kinds of acne forms, inflammation papule, pustule, tubercle, cyst and scar,etc.. which are all very injurious.
Most dermatologists think, the emergence of the acne relates to the fact that the sex hormone lincrease in a large amount in adolescence. Sebaceous glands volume increases as a result of androgen level increases and excess sebum secretion; Too much sebaceous accumulate in hair follicle forming fat bolting, so called acne; So the acne bacillus reproduces a large number in hair follicle causing inflammation in sebaceous glands of hair follicle.
The initial form of acne is usually shown in two category, white head (close comedo) and black head (open comedo).
Black head acne is also called the open comedo, it is the black dot that is obviously expanded in the pore and if you use the hand to push it, it comes out with around 1 mm milky white fat bolts and the top is black.
White head acne is also called as close comedo, it is a small sharp grayish white papule and is not easily to squeeze the fat out. Acne can further develop into papule inflammation, pustule, tubercle, abscess, cyst and scar