What is the ruling regarding my prayers which I performed, forgetting the presence of a medical patch on a wound on the sole of my foot, knowing that water reached the patch but I did not wipe over it?

If a medical patch remains on a limb after performing ablution, and it was forgotten, then if it prevents water from reaching the limb and there was no necessity for it (due to a wound), the ablution is invalid, and the prayers performed with it must be repeated. However, if there was a necessity for it, and water flowed over it when the limb was washed, then the ablution is valid, because washing suffices for wiping.