To me it happened for maximum a week after dedication, but if it happens for more time, might be because of these two:
1. If you sterilized the needle (or what you used during dedication), it may be just your mind focusing on it, and you are now probably thinking of it subconsciously being a symbol of your dedication, as you said you also interpret it as Satan thinking of you.
2. However, if you didn't sterilize the needle before (using either a lighter or alcohol), it is possible that what you're feeling (especially a feeling of pulsation) are your white cells fighting some bad bacteria or germs that were on the needle.