Hi, my name is AAAA  and i am 14 years old. Ever since a bat hit my mouth with it s mouth leaving saliva on my mouth. I have lower backpain and this dark line going down my spine . What could it be? And if this helps, i did a back tuck on my trampoline yesterday and i landed on my neck . Now the line is darker and goes along my whole spine, and my whole back aches.
In my opinion your salivary gland is traumatized and that is only causing salivation. Along with this your cervical spine is traumatized. And following twisting exercise local hematoma may be tingled down what caused dark line. Please wear cervical collar and a course of antibiotic. Advise you to get MRI scan of cervical spine and consult neurosurgeon