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Dermatology is a branch of medicine focused on diagnosing and treating conditions related to the skin, hair, and nails. Dermatologists are medical professionals who specialize in dealing with a wide range of skin issues, including acne, eczema, psoriasis, skin cancer, and infections. They use various techniques such as medication, surgery, and laser therapy to manage skin conditions and improve patients' overall skin health. Additionally, dermatologists may provide preventive care and advice on skincare routines to help maintain healthy skin and prevent future problems.

Etymology is the study of the origin and history of words. It looks at where a word came from, how its form and meaning have changed over time, and what languages it has passed through. For example, the word "ballet" comes from the French language, which borrowed it from Italian, and it originally came from a Latin word meaning "to dance". Etymology helps us understand the roots and evolution of words in different languages.

A biography is a detailed account of a person's life, written by someone else. It covers various aspects of the individual's life, including their background, achievements, experiences, and significant events. A biography aims to provide a comprehensive view of the person's life and impact, often highlighting their contributions, struggles, and personal growth. It can be written about historical figures, public personalities, or ordinary individuals, offering insights into their life story and character.