How will this affect my parents’ credit scores?

Let’s say that my parents co-signed a credit card for me because I’m not 21 yet, and that I pay my balance in full every single month. Will my parents’ credit scores be negatively affected just by cosigning my credit card?

In general, does increasing one’s credit limit lower one’s credit scores? I know that hard inquiries for credit scores can lower credit scores 10-20 points a time, but what about applying for credit in itself?

Thanks in advance!

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