What is the Difference Between Nodule and Cyst?

The main difference between a nodule and a cyst lies in their composition and texture. Here are the key differences:

Nodule: A nodule is a solid mass in the skin that can be elevated from the skin or palpated. Nodules are firmer and often very painful, feeling like knots under the skin. They can be found in various forms of acne, such as nodular acne, which is a severe type of acne that causes hard lumps to form under the skin.
Cyst: A cyst is a nodular lesion containing fluid. Cysts can be softer than nodules and are often fluid-filled cavities. They can appear in different disease conditions and can be found in various parts of the body, such as the skin or internal organs. Cysts can be caused by various factors, including blockage of ducts or swelling in a part of the body.

In summary, nodules are solid masses in the skin, while cysts are fluid-filled lesions. Both nodules and cysts can be found in various parts of the body and can manifest in different disease conditions. However, the key difference between the two is their composition, with nodules containing solid materials and cysts containing fluid.