axle leak ???

hi , i've gone outside today and noticed some fluid on the insude of my tyre like the axle is leaking something !!
no is it likely to be the lubricant of some king leaking from the swivel or is it the oil from the diff and associated tube ? if it is the swivel lube will draining it and using on shot grease buy me some time ?

what to do ?

regards baz

I would have thought one shot would be in there by now but if not you can use yes it may not leak but remember if oil can get out water can get in could be oil seal in hub or brake. Fluid ?