What Is The Side Effects Of Implanon?

Hello. I had the Implanon implant fitted about 48 hours ago. This morning I undid the bandage because my arm was so sore, and there looks like a burst blister around the entry point of either the implant itself or the local anesthetic. Is this normal?! And is there anything I can do to hurry the healing? It really is very sore, although doesn't look infected. Thank you!