What defines a bulla in dermatological terms?

In dermatological terms, a bulla is specifically defined as a large, fluid-filled blister that is greater than 1 cm in diameter. It is typically characterized by a raised area of skin that can be filled with serous fluid, which is a clear fluid often found in blisters. This definition aligns perfectly with the concept of a bulla as it pertains to dermatology, encompassing the features of size and fluid content that distinguish it from other skin lesions.

Understanding the characteristics of a bulla is important in clinical practice, as it helps differentiate between various types of lesions. For instance, smaller fluid-filled lesions that are less than 1 cm are classified as vesicles, while solid nodules less than 1 cm are known as papules. Therefore, recognizing the size and content of these skin lesions is vital for accurate diagnosis and treatment planning in dermatological cases.