Final answer:
Nodules are abnormal growths or lumps that can occur in various parts of the body, commonly seen in acne lesions or boils. They can also occur in swollen lymph nodes or inflamed conjunctiva. Nodules are caused by factors such as infections, inflammation, or tumors.
Step-by-step explanation:
Nodules are abnormal growths or lumps that can occur in various parts of the body. They can be caused by a variety of factors, including infections, inflammation, or tumors. In the context of skin disorders, nodules can refer to the presence of acne lesions or boils. Acne nodules are large, painful, and deep-seated bumps that develop when bacteria infect sebum-clogged pores. On the other hand, boils are inflamed and pus-filled bumps that form as a result of bacterial infection. When multiple boils develop into a deeper lesion, it is called a carbuncle.
Nodules can also occur in other parts of the body, such as swollen lymph nodes or conjunctiva. Swollen lymph nodes, also known as buboes, are caused by microbial infections. They commonly occur in diseases like bubonic plague, where they are a distinguishing feature. Inflammation of the conjunctiva with nodules can also be seen in certain conditions.
Overall, nodules are abnormal growths or lumps that can occur in various contexts within the body, including as acne lesions, boils, swollen lymph nodes, or inflamed conjunctiva.