Tahaarat

Will a graze without flowing blood break wudhu?

Q:

1. Would a graze that isn't flowing out blood, but would leave a faint print of blood on anything it came in contact with, break your wudhu?

2. In the above mentioned situation, say if the non flowing blood continuously came in contact with another part of the body or clothes etc., is it compulsory to wash that part of the body or clothes before performing salaah?

Using a western toilet

Q:

1. Is it allowed to use the western toilet in Islam?

2. While performing instinja on an indian toilet, water splashed on my feet and body from my private parts. Also sometimes, water splashes from the toilet surface. Are these splashes impure? 

Urine splashes on toilet seat

Q: I have had rectal problems for the past couple of years and I try to keep a slight gap at the back when I sit on the toilet. However, it felt like something fell on my back and I knew for sure it could not have been urine splashing on me. Later, I tried to check if urine splashes fell on me, but I couldn't tell. When I went the third time I saw one splash fall on the seat, so I was worried if this was happening all the time but I was unaware.

My questions are:

1. Do I have to have a shower and change anything that could have come in contact with me?

2. Are all of my prayers valid?

3. Have I made anything najis from touching that part of my body?

4. This is how most people use the toilet so should I tell my family members to be careful and sit all the way back.