Wudhu

Q: I was sitting after performing salaah when I noticed that there is a black, sticky substance on my foot through which water could not pass. It was the size of a whole round fingernail, and I had not seen it before.

Then, my brother told me that he saw it since 3 or 4 days on my foot. I had also led jamaat during these days. Will I have to repeat all the salaah that I had offered on these days? Will those who followed me in jamaat also have to repeat their salaah?

Q: If I have treatment done on my face and cannot use water for nine hours, will tayamum suffice?

Q: If I have olive oil in my hair and I make wudhu/ghusl afterwards, is my wudhu/ghusl accepted?

Q: Recently, I had two blisters on my arm, very close to each other, which ooze with pus. When I wash them, the pus starts coming out again. So I put plasters over both these blisters after the pus stopped flowing out. When it comes to performing wudhu, then how do I wash the narrow skin area between the two plasters without getting the plasters too wet?

Q:

1. Is it necessary to make wudhu for each salaah if one has discharge randomly throughout the day?

2. If one salaah was read and by the next salaah time there is no discharge seen nor felt, is it necessary to make wudhu?

Q: If I use a miswaak before performing salaah at home alone, will I still get the reward of 70 times more as if I were to perform the salaah in the musjid?

Q: When I test my blood sugar, after the prick, the blood does not come out on it's own. I have to squeeze my finger to make the blood come out. Does my wudhu break through this?

Q: How many litres of water would Nabi (sallallahu alaihi wasallam) use for wudhu and for ghusl?

Q: If one has oil in their hair and performs wudhu, is the wudhu valid?

Q: If the nail gets long and were not cut in a week, will the wudu and namaz still be valid?