types of inflammatory acne, papule, pustule, nodule and cyst on white background.

acne aesthetic anatomy background bacteria bacterium beauty biology body care cause comedo comedone concept cyst dermatology dermis disease epidermis face facial follicle formation glands hair health healthy hormones human hypodermis illustration infection inflamed inflammation inflammatory keratin keratinocytes layer medical nodule pacnes papule pimple pores problem propioni propionibacterium pustule sebaceous sebum skin structure surface treatment types vector white