I fell on a screw about 26 hours ago It

Patient: I fell on a screw about 26 hours ago. It went through my jeans into my left butt cheek. I went to the hospital and got a tdap shot and they gave me instructions to keep antibiotic ointment 2x day and general wound/puncture instructions. I was cleaning it this morning and noticed something. I pulled off/out one tiny fiber of jean fabric. I don’t want it to get infected etc. I can see more but I don’t know how much there is or what I should do?

Images:
I fell on a screw about 26 ...-1

Doctor: