system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what is the difference between blackheads and pimples?
gpt
Seeing a lot of misinformation. A blackhead and a “pimple” are the same thing in essence.  Both are actually called comedomes.  They are blocked pores or hair follicles.  A blackhead has a wide opening and oxidizes.  A whitehead is closed.  Blackheads are open comedomes.  Whiteheads are closed comedomes.  Both are types of non-inflammatory acne and can be present in more severe acne as well.  These lesions are just blocked collections of natural sebum production, the oil your skin uses to lubricate itself. 

Comedomes are differentiated from pustules and cysts.  Cysts are deep, often firm, and do not manually express…easily.  Pustules are more yellowish and are filled with pus from bacteria and neutrophil collections.  These two types of lesions are present in more severe, inflammatory acne types.