There are more than 1400 skin diseases. Yet, only 30 are important, common, and worth knowing. The first
step toward their recognition is the separation of primary from secondary lesions.
Primary lesions result only from disease and have not been changed by additional events (such as
trauma, scratching, or medical treatment.To better identify primary lesions, pay attention to
their colours, shape, arrangement, and distribution.
Secondary lesions instead have been altered by outside manipulation, medical treatment, or their own
natural course.
step toward their recognition is the separation of primary from secondary lesions.
Primary lesions result only from disease and have not been changed by additional events (such as
trauma, scratching, or medical treatment.To better identify primary lesions, pay attention to
their colours, shape, arrangement, and distribution.
Secondary lesions instead have been altered by outside manipulation, medical treatment, or their own
natural course.