Yes it does feel like a hard round bead, and I will stick a pin it and see if pus drains, probably later when Ive finished working as I tend to get dirty.
I let you know what happens when I stick it!
Thanks for your replies Hv and lolite.
Pawel
edit -
I stuck it with a pin but doesnt drain - so is more solid - just a bit of blood can be squeezed out when pressure is applied.