The word patch is sometimes used to describe a large macule. A more precise definition of a patch is an area of the skin that is not elevated but has surface change such as scale or crust. An example of a patch is tinea corporis. Depending on the source or reference review, the term patch can include either of these two definitions.
A plaque is a well-defined lesion that has a plateau-like elevation and is typically larger than 5 mm in diameter. The term plaque can also be used to describe a confluence of papules. An example of a plaque is a lesion of psoriasis.
A nodule is defined as a space-occupying lesion in the dermis or subcutaneous tissue. Its breadth is typically larger than its height. Surface changes may or may not be present. Most authors agree that nodules are typically larger than 1 cm in diameter, and they can be much larger.
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