Register for a free account Sign up for a free Medical News Today account to customize your medical and health news experiences. Log in with your Medical News Today account to create or edit your custom homepage, catch-up on your opinions notifications and set your newsletter preferences. Pustules are small red pimples that have pus at their tips. Cysts are large lumps found beneath your skin that contain pus and are usually painful. Inflammatory lesions listed below are more likely to cause scarring of your skin:.
The most common cause is overuse of corticosteroids.
What you need to know about acne