No worries, it's just particles from your clothing or ties if you supercropped. You can leave it on, pick it off by hand, or "wash" your buds. For washing, look up the 3 bucket method. It will take any loose particles of your bud including dead insects and their fecal matter. Trichomes dont dissolve in water, so it may seem weird, but you're not hurting your product. If it's just you smoking, you won't even notice it if you accidentally smoked some fibers. Good luck either way!