I found a piece on my leg that prevents water from reaching the skin, and I do not know when it attached; should I repeat the prayer?

Question:
May Allah reward you, Your Eminence, father. The questioner says: I found a very small piece on my leg that prevents water from reaching the skin, and I do not know when it attached to my leg. What is obligatory for me? Do I repeat the prayer? And how many prayers do I repeat?

Answer:
If you found this piece on your leg after a previous prayer and a long time has passed, do not repeat the prayer, because it appears that it attached to your leg after the prayer due to the length of time. However, if the time is recent and it is not possible that it attached to your leg outside of the prayer, then you repeat the prayer, because it appears that it was on your leg before the prayer, as long as the time is recent.