I have been getting unexplained random bruises all over my lower legs. I am on implanon. Also get lightheaded disoriented dizzy and see stars at time?

Need to see your MD. Implanon is implantable birth control device, containing etonogestrel , usually pretty safe, and effective. If you have bruises , you platelet count may be low , may have a reaction see your physician for evaluation and blood tests and treatment ( possible removal if it is due to drug reaction ).