CHICAGO -- There is a new warning about the skincare obsession among preteen girls on social media.

New research finds that girls as young as 7 are sharing their skincare routines, sometimes using products some researchers say they really shouldn't be.

There is an investigation finding tween skincare routines may be causing more harm, to skin and parents' bank accounts, than good.

Researchers from Northwestern University created TikTok accounts pretending to be 13-year-olds and reviewing 100 skincare videos on TikTok from girls as young as 7.

Among the top 25 most-viewed videos, investigators found an average of 11 active ingredients that could irritate adolescent skin, including citric acid, salicylic acid and glycolic acid.

But the study, which relied on a small sample of 100 TikTo

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