What are open lesions on the skin that are accompanied by pus and loss of skin depth known as?

Open lesions on the skin that are characterized by the presence of pus and a loss of skin depth are known as ulcers. Ulcers represent a deeper tissue disruption compared to other skin lesions, often extending beyond the outer layer of the skin and affecting the dermis or underlying tissues. This can lead to a significant level of inflammation and can be the result of various factors, including infections, pressure, or other underlying health conditions.

In contrast, blisters are fluid-filled sacs that form on the skin surface but do not involve pus or tissue loss. Pustules are small bumps on the skin that contain pus; however, they do not have the extensive loss of skin depth that characterizes ulcers. Scabs are crusts that form over healed wounds but do not represent an open lesion with pus. Understanding these distinctions helps clarify the specific nature of different types of skin lesions.