Found: Fairy/ faerie book with a plain black cover and a glowy blue fairy in the middle

I only really remember the cover, though it was a book about a fairy in the human world. I remember it being part of a series, there was definitely another book with a similar cover, plain black with a glowy red fairy.

I think it was around 6-7 years ago that I read this book

I Was a Teenage Fairy by Francesca Lia Block fits your description, both in terms of cover and basic plot. I don't believe it's part of a series, however.

Sounds a lot like Faery Rebels. The first one is Knife.

>4 RosetheReader: Omg yes that’s it thank you so much!!!