Medically reviewed by William Truswell, MD Nodular acne is a painful, severe form of inflammatory acne that forms hard lumps under your skin.Over-the-counter treatments do not work for nodular acne, ...

Acne can be a drag, especially when it sets up shop in hard-to-reach places, like on your back. But by learning what causes back acne and getting to the bottom of what might be triggering your ...