Tutorial A: The Primary Lesions. Primary lesions are physical changes in the skin considered to be caused directly by the disease process. Types of primary lesions are rarely specific to a single disease entity. 1. MACULE. A macule is a change in the color of the skin.
Colloid nodules develop from a lack of iodine, which is a mineral essential to the production of thyroid hormones. These growths are noncancerous, but they may be large. Thyroid cysts are either filled with fluid, or a mixture of fluid and solid tissue. Hyperfunctioning thyroid nodules produce thyroid hormone, which may cause hyperthyroidism.
A papule is an area of abnormal skin tissue that is less than 1 centimeter around. A papule has distinct borders, and it can appear in a variety of shapes. Papules are often called skin lesions, which are essentially changes in the color or texture of your skin.