Usually describes teenage skin, which is prone to acne and pimples. Many adolescents feel self-conscious about their pimply complexion.
Pro Tip 2/3
Negative Emotion
May have a negative connotation, implying undesirability or poor hygiene. She was worried her pimply skin might make a bad first impression.
Pro Tip 3/3
Informal Context
Considered informal, used more often in personal conversation than formal writing. In the novel, the author described the character as a pimply young boy.