A primary lesion that is defined as a solid mass within the skin is known as what?

A primary lesion that is defined as a solid mass within the skin is referred to as a nodule or tumor. This type of lesion is characterized by its elevated nature and its depth within the dermis or subcutaneous tissues. Nodules are typically larger than papules, often measuring more than 1 centimeter in diameter, and can vary in consistency from soft to hard, depending on the underlying tissue composition.

Nodules can represent various conditions, including benign growths, cysts, or more serious pathologies such as tumors. Understanding this helps estheticians identify and differentiate skin lesions during skin assessments, which is crucial for proper treatment and referral when necessary.

Other options represent different types of skin lesions. A macule is a flat, distinct, colored area of skin that is not raised; a pustule is a small, raised, inflamed lesion that contains pus; and a patch is a larger flat area of discoloration similar to a macule but over 1 centimeter in diameter. None of these describe a solid mass within the skin, making the nodule or tumor the correct term for this definition.