A case study is a written account of work that’s been performed on a client. Case studies demonstrate understanding and critical thinking about treatments provided, and documenting this for the rest of the world to see. Cosmetologists are trained and certified to provide hair, skin, and nail cosmetic treatments. Clinical Cosmetology is concerned with procedures and operations used as corrective measures to improve the appearance of a person's body. Any procedure's pre- and post-operative consequences are also carefully planned. The post-operative effects may result in the development of new disease or the formation of permanent scars. Postoperative effects can be reduced with the use of personalized drugs and methods.