Do medical injections invalidate Wudu’?

A: Injections do not invalidate Wudu'. Moreover, the discharge of a small amount of blood from the injection site is excused. If one sees traces of blood on one's garment after performing Salah having not known of it before or having known but one forgets and remembers only after Salah, it is not obligatory to repeat the Salah. If the blood is a small amount, it is pardonable regardless of whether one knows of it or not.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.