It is true about the message that

zits and pimples are synonyms

c-

Pimples, rash, freckles and zits are common skin conditions most noticeable on the area around one's face. They consist of small itchy bumps that when punctured give way to a rush of pus, the larger the blister the more copious the amount of jaundiced liquid erupting from the lunar crater. 

Resposta no final da passagem, o qual revela o objetivo da "carta".

obs.: embora parecidos há diferenças entre zits & pimples:

http://www.diffen.com/difference/Pimple_vs_Zit