My dog had a lump it's now bleeding and I can't touch it he tells he is a big dog and I know he is in pain squeeze it or what??

Take him to the vet!

Did this lump just suddenly appear?

A lump that bleeds needs to be looked at. No one can diagnosis on the internet. Bleeding is something that a dog needs to go to the vet for. Good luck for you and your furbaby.
Make sure when you take him in you tell the vet he will not let people near it as he may need to be muzzled for his safety and the vets.