Etonogestrel
"I got implanon put in about a year ago. The first month or two I had light spotting for a few weeks, then after that my period and any bleeding has stopped altogether.
I have not experienced any weight gain.. I've actually lost about 20 lbs but I have an active lifestyle and eat sensibly so I can't say this helped me lose weight but it may have. 
I have been struggling with acne for years and it has been under control the past few years, so I was worried about a new birth control would do to my skin, but my face acne had no changes. My only complaint about implanon is that I've started to get some shoulder and back acne. 
 I don't feel overly hormonal like I have on my past oral contraceptives. I really enjoy this birth control overall."