A skin lesion is a part of the skin that has an abnormal growth or appearance compared to the skin around it. There are two categories of skin lesions, primary and secondary.
Primary skin lesions are present at birth or are acquired over your lifetime. A birthmark would be an example of a primary skin lesion. Secondary skin lesions evolve from primary lesions or develop as a consequence of your activities. Melanoma resulting from sun exposure would be an example of a secondary skin lesion.
Precancerous skin lesions form where your skin has been frequently exposed to sun, especially the face and hands. These will typically begin as rough feeling skin that is painful to touch. They will also likely be dry, scaly and red. If left untreated, they can develop into skin cancer.
If you notice changes in your skin, especially like those described above, it is imperative you see a dermatology nurse practitioner.