types of acne on white background. formation of noninflammatory and inflammatory acne.

acne pimple whitehead blackhead papule pustule nodule cyst types nodular cystic nodulocystic skin face inflammatory noninflammatory inflamed pus severe swollen clogged pore spot scar formation breakout blemish sebum sebaceous gland follicle dead cells propionibacterium acnes epidermis surface hormone bacteria beauty body dermatology dermatologist care infection vector problem treatment flat design infographic diagram damage