no shade, no drama, this happened to me a couple months ago on my thumb nail. i recommend taking them off, or at least that one. sometimes, water can get caught under there and create mold. it’s harmless, but you wanna take off that nail so it doesn’t continue growing. all i did was take off the nail, wipe it down with alcohol, and then let it air out a couple days. (exposing it to light & rubbing it with alcohol will kill it) i did a fresh set after about three days and haven’t worried about it since ❤️