Historical clue formulations

• Some hormonal flare-ups — 2024-09-26
• Comic strip with a teenage protagonist — 2023-11-10
• Popular comic strip about a 17-year-old high school student — 2022-07-20
• Concerns for a dermatologist, informally — 2019-08-20
• Dreaded dermal development — 2016-12-09
• Jerry Scott/Jim Borgman teen comic strip — 2014-06-11
• Some get them in their teens — 2014-05-15
• Teens might try to hide them — 2006-09-01
• Bad marks in high school, maybe — 2000-12-02
• Mug imperfections — 1999-08-21