I feel for you I've done it myself and it does hurt. I cleaned it off with alcohol pad, put some Neosporin on it and a band aid and it didn't get infected. I watched as my finger went thru and watched the needle pierce it and couldn't stop it just let it go thru. I didn't get a tenus shot and I didn't have any problems just was sore and couldn't use it for a few days. My needle wasn't rusted so I wasn't worried about a tenus just cleaned it up. Thinking of you hoping it gets better quickly. Sue