Did something similar on a 6-354 Perkins genset. Had a small run of diesel round the filter bowl after starting up, wrapped my hand round the filter and into the fan.
Went up to Edgware Hospital, they couldn't do a lot with the mess, but cleaned it up and bandaged it all, it took 4 weeks or so to heal.
Why do fingertips and toes always get banged/knocked when they hurt the most, but hardly ever when you are injury-free? I dropped an engine block on my toes once, drove into town to the hospital, walked through casualty trailing blood, got it all sorted out, but after I got home my youngest bounced on my bad foot when I sat down! He didn't realise, obviously, but it hurt like hell!
Peter