One-word substitution (medical specialty): Identify the branch of medicine concerned with the skin, its structure, functions, and diseases. Context: Distinguish skin medicine from hormone study, family lineage, and bone/joint surgery. Instruction: Choose the most accurate single-word substitute.

Given data

• Definition: Medical study of skin and skin diseases.
• We must choose the correct specialty name.

Concept / Approach
Dermatology = skin medicine. Endocrinology = hormones/glands; gynealogy (likely ‘‘genealogy’’ in common use) = family lineage; orthopaedics = bones/joints/musculoskeletal system.

Elimination
Dermatology — correct focus on skin. ✅Endocrinology — endocrine system; not skin. ❌Gynealogy — family history; not medicine. ❌Orthopaedics — bones/joints; not primarily skin. ❌

Example
‘‘A dermatology clinic treats eczema and psoriasis.’’

Final Answer
Dermatology