Which medical term signifies 'blisters' or 'open-sores'?

The term that signifies 'blisters' or 'open-sores' is 'ulcerations.' Ulcerations refer specifically to the loss of the skin or mucous membrane that can lead to the formation of open sores. These sores are often fluid-filled and can be symptomatic of deeper tissue damage, inflammation, or infection.

In medical contexts, ulcerations may be associated with various conditions, including pressure sores, diabetic ulcers, and venous stasis ulcers. They are characterized by their open nature, which differentiates them from other lesions that may not have an open surface.

While abscesses refer to localized collections of pus often surrounded by inflamed tissue, and cysts describe fluid-filled sacs that are not necessarily open or sore, the concept of ulcerations is directly aligned with the description of having open sores. Carbuncles are similar to abscesses but consist of interconnected furuncles (boils) and are not specifically indicative of blisters or open sores.