Brief Answer: Probably nothing, suggest Doppler Detailed Answer: Hi, welcome to our site. I am Dr Saumya Mittal. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query This probably is not a big deal. The chances are that this is just symptomatic and will resolve on its own. However, having said that, I would have been more comfortable if you had both limb swelling. The reason I say so is that you already have a neuropathy. So there are chances that the associated symptoms like pain are missing due to the neuropathy. I would suggest you to observe the foot carefully for any injury. And also get a Doppler Study of the left lower limb. This is to rule out any vascular problem. I would also suggest that if you want to do long walks, which is a good thing considering your diabetes status, have proper and comfortable footwear. I hope this helps you. Inform the reports mentioned above so i can be of help further. Best of luck. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this)

---