These can both be caused by the pores becoming clogged with oil ... we put together a short guide that explains the different ...

Though clogged pores are extremely common and pretty easy to identify, understanding how they actually occur is a different story ... to assess a patient's skin type and sensitivity first ...

What makes blackheads different is that the pore is open to ... considered the most serious type of acne, McMahan says. Similar to nodules, cysts are caused by clogged pores beneath the surface ...