Question Summary:
Do I have to repeat my Salah if I find a small quantity of blood on my clothing?

Question Detail:

 
I led Friday prayers last week. In the evening I found that a small (about pinhead) blood stain was on my shirt.
Q1. Do I and my followers in Friday prayer need to say the prayers again?
Q2. If yes, will it be 2 rakas (like Friday) with Khutba or 4 rakas like ordinary Zuhur?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
The prayer was valid. Hence, there is no need to repeat the Salat.[1]
 
 
And Allah Ta’āla Knows Best
Muntasir Zaman
Student Darul Iftaa
USA
Checked and Approved by,
Mufti Ebrahim Desai.