PG usually presents as a skin ulcer; however, there are several other variants including bullous, pustular, and superficial vegetative types. These skin lesions are very painful. They are most commonly on the legs and feet but can occur anywhere on the body.
PG typically begins as a very painful, deep-seated, pus-filled bump surrounded by redness or as a single bump on a purplish base. These lesions then typically rupture or breakdown to form a painful open sore, also known as an ulcer. Surrounding the ulcer is a purple or bright red halo. As the ulcer develops over time, it begins to develop a pus-filled coating over its center. The border of the ulcer becomes worn and damaged, overhanging, and irregular. These ulcers can also become infected by bacteria, causing them to develop a very unpleasant smell.