types of scars. acne scars. keloid, hypertrophic, atrophic, normotrophic. the anatomical structure of the skin with acne

acne anatomical atrophic blackhead blackheads body comedo cosmetology damage dermatology dermis disease epidermis face facial heal health healthy human hurt hypertrophic illustration incision infection inflammation isolated keloid medical medicine nodule normotrophic operation papule pimple pore pustule scar scars scratch skin structure surface surgery tissue treatment types vector