Underground pimples

Underground pimples are called 'nodules' or 'cystic acne' (there are many different types of acne). Nodules hurt and you can't pop them. You just have to wait for them to go away. Causes vary from person to person, but they usually come from grubby skin, grubby diet or hormone fluctuations.

Some remedies you'll find around the place include blasting with a hairdryer to bring yucky stuff to the surface (citation needed), honey and cinnamon, turmeric, tea tree oil, a warm towel, and ice (provided it doesn't make the pain worse).