Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This sounds concerning, especially to be having relapse of blood four months after the initial incident. It is possible to be related to the previous head trauma, and if so, my concern is that there could be an infection or even a shard of bone from a previous fracture that is migrating and causing issues. Or a tooth may have broken and now the root is migrating into the nasal cavity.
This is something that is really going to require an exam by your vet. If this was my patient I would need to perform an examination followed by some X-rays of the head/skull to know if there is a problem in the nasal cavity (sometimes dental X-rays are much better than full skull X-rays to look at this area).
Advanced imaging (such as CT or MRI scan) might actually be more beneficial to truly elucidate what is going on in this area, but that would be expensive.
There is nothing you can easily do for this at home. Using saline nasal drops is a possibility but I think this will only serve to aggravate the problem and not improve it. There are no decongestants that are safe in cats to purchase over-the-counter and I am not sure they would help this problem, especially if there is something actually in the nose or an infection hat would require medication to clear.
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