Final answer:
Open lesions on the skin with pus and tissue loss are known as ulcers or suppurative infections, which include conditions such as acne and impetigo.
Step-by-step explanation:
Open lesions on the skin accompanied by pus and loss of skin depth are known as ulcers or suppurative infections. These occur when bacteria cause a localized inflammation in the skin, ultimately leading to the production of pus and tissue destruction. Conditions such as acne can cause pustules, which are small pus-producing; suppurative bumps on the skin. Infections like impetigo and more severe lesions such as carbuncles involve the development of large pus-filled areas, which may be accompanied by systemic symptoms like fever. Such infections require medical attention, including drainage and antibiotics.