1) Acne is a chronic inflammatory disease of pilosebaceous follicles, characterized by comedones, papules, pustules, nodules, cysts, and often scars.

2) Methods The sonographic characteristics in 30 cases with pilosebaceous cyst proved by pathology were studied. Results The sonograms manifested as follows.

3) Acne is a common pubertal diseases of pilosebaceous chronic inflammation, characterized by acne, papule, agria, inflammatory nodus, superficial purulent cyst and deep inflammation.

4) The density of pilosebaceous units decreases throughout life, mainly because of the poor development of the secondary follicles.

5) Human Demodex is a permanent parasitic mite that is obligatorily harbors in hair follicles and in pilosebaceous glands of human skin, especially human facial skin.

6) Conclusion With particulate systems topical CPA treatment may be an additional therapeutic option for acne and other diseases of the pilosebaceous unit.

7) Together , the hair follicle and sebaceous gland are often referred to as the pilosebaceous follicle.

8) Cutaneous disorders attributed to sebaceous glands, such as acne vulgaris, are really disorders of the entire pilosebaceous unit.

9) Objective To evaluate the clinical value of high-frequency ultrasonography in the diagnosis of pilosebaceous cyst.