Must the 'Ishā prayer be repeated after delaying it due to bleeding from a bodily pimple, knowing that the blood did not transfer except through firm contact, and was the calculation of midnight correct?

If blood exits but does not stop, one waits for it to cease, unless the time for prayer is about to expire. If the blood continues uninterrupted until just before the prayer time ends, one prays in that state. Delaying prayer until the bleeding stops is valid. The Isha prayer is considered adaa' (performed within its prescribed time) if it is prayed before midnight. There is a difference of opinion regarding whether the Isha prayer becomes qadaa' (performed after its prescribed time) after midnight, or whether it remains adaa' but with sin for one who delays it without an excuse. The majority view is that it remains adaa' but is contrary to what is preferred. A small amount of blood that is excused does not render the garment impure, and prayer with it is valid.