We moved into a new house last year, and this summer we are noticing that the tree is oozing a lot of sap and has began to drop pine needles while other needles are starting to turn a light brown colour. Is this due to disease? I peeled back a couple of the sap lumps to find what looks like lesions in the bark, as you can see in the images.
Edit: I peeled back the bark and found this^
Additional context: the tree is in Southern Ontario, Canada