: Characterized by thickening of the epidermis and a "subepidermal low-echogenic band" (SLEB) representing inflammation. 3. Cosmetic & Aesthetic Procedures

An is a critical visual guide used by dermatologists and radiologists to diagnose skin, hair, nail, and soft tissue conditions non-invasively. It bridges the gap between clinical appearance and internal anatomy, often providing "skin deep" knowledge that the naked eye cannot see. 🔬 Fundamental Principles

: Typically seen as hypoechoic (dark) lesions with irregular borders.

: Ultrasound helps measure the depth (ultrasonographic Breslow index) and check for nearby satellite metastases.

: Appears dark (hypoechoic) because it is mostly fat lobules.

: Also hyperechoic but slightly less so than the epidermis due to collagen content.