Final answer:
A tumor is an abnormal swelling, lump, or mass that can be either benign or malignant. A nodule is a small solid mass that can also be benign or malignant. A vesicle is a small fluid-filled sac, while a bulla is a larger fluid-filled sac.
Step-by-step explanation:
A tumor is an abnormal swelling, lump, or mass that can be either benign or malignant. Benign tumors do not invade other tissues and do not form metastases, while malignant tumors are the actual cancer and can invade surrounding tissues. On the other hand, a nodule is a small solid mass that is often found in the skin or lungs, and it can also be benign or malignant.
A vesicle is a small fluid-filled sac, while a bulla is a larger fluid-filled sac. Both vesicles and bullae can form as a result of various medical conditions, such as infections or blistering diseases.