The site of pain suggests that your pain indeed might be due to swelling. You should be evaluating the swelling in your foot with help of orthopaedician and imaging studies.
What kind of swelling is it? Is it hard or soft? Is there any discharge from the swelling? Have you done any x-ray of foot recently?
Is there any pain which wakes you up from night?
Can you describe actually where the pain is?
The knot itself is hard like bone. There is no discharge from the area and my foot does not look swollen. I haven't had any x-rays and also no known trauma. The pain woke me up once but not any more. The pain is not where the knot is located. Sometimes the pain is like a cramp and in the normal area where you would get a cramp. The rest of the time it is on the outside, middle, bottom of my foot, What are the possible disgnosis? Please advise.
The possible diagnosis could be fracture or any bony growth.
The symptom of pain at the bottom of foot suggests that you might have a stress fracture, Calcaneal bursitis, or retro-Calcaneal bursitis.
You can get X-rays, including AP, lateral, and oblique views, should be obtained, but it must be remembered that X-rays may not show changes for up to 3 weeks after a stress fracture. Bone scan and MRI may help confirm the diagnosis and may be positive as little as 2 days after stress fracture.
The radiologist need to see whether there is a fracture or not. If a fracture is found then he should look for displaced fracture or an un-displaced fracture, as the treatment for both conditions varies.
Hope this helps.
Thank you for your time and answering my questions!