Open bumps on the skin that 
fill with excess oil and dead skin. They look as if dirt has deposited in the bump, but the dark spots are actually caused by an irregular light reflection off the clogged follicle. 

This type occurs when an excess of yeast develops in the hair follicles. They can become itchy and inflamed. 

Solid pimples that are deep in your skin. They are large and painful. 
Cysts: Pus-filled pimples. These can cause scars. 

Pimples containing pus. They look like whiteheads surrounded by red rings. They can cause scarring if picked or 
scratched. 

Small red or pink bumps that become inflamed. 

 Bumps that remain closed by oil and dead skin. 

Pus-filled pimples.

These can cause scars.