Suspicious accounts are Instagram bots, stolen accounts, abandoned accounts and people who use specific tools to artificially boost their accounts' followers, likes, and comment number.
It's okay to have some suspicious accounts among your followers. Some of these people may have lost their credentials or have simply stopped checking their social media. Some represent commercial Instagram accounts (e-commerce or businesses) who try to promote their page and get more customers by using follow/unfollow method. All of them come organically.
Your goal is to keep the level of suspicious accounts among your audience as low as possible.
How to? Simply check the Audience Authenticity section in theright.fit report on a regular basis. This metric gives you a warning sign if the number of suspicious account is getting high enough to flag.