Stung by vasp on index finger

Hello, 

Today I was simply eating a sandwich and before I knew there was 6 Vasps buzzing in my food which is fine but one of them stung me I on my index finger of left hand. I have notice they have been quite attracted to me even I don’t have any food out. There is 1-2 buzzing around curiously I know they are attracted to sweat and salt which I am since I’m in and out ocean these last days. 
I just thought this was interesting since normally they are not curious of me. 

regards 

Diana