HS lumps may vary in size. Some appear like small pimples, while others look like large cysts or boils. They typically range in size from 0.5 to 2 cm (0.2 to 0.8 inches).
When left untreated, HS lesions can scar and thicken, with severe cases becoming so large that they might interfere with mobility. This is more common in areas where skin rubs against itself, such as the armpit or inner-thigh areas.