The type of acne you've described is called "inflammatory acne." It's usually caused by inflammation under the skin, a stage where bacteria are multiplying and causing inflammation. It may start as visible, red bumps that are sometimes painful, while the skin remains smooth. However, if you press on it, you can feel something inside because the acne is developing. At this stage, don't ask your doctor to inject the acne, as it won't help and may even cause further problems, such as skin indentation. Here's what we recommend: