i didn't know what the uck it was either, so obviously the first thing to do was take a pic before heading down to the hospital to get it looked at
apparently it's an infection, possibly due to me not being well
i've been given some cream to put in it overnight and it was cleaned up
but fuck me i thought i was going to go blind

but it's not unusual and have been told to keep it clean with warm water and cotton wool if it starts to build up again
to be fair though, at least they didn't call me the blue peter tortoise