Hi, thanks for sharing your health concerns with HCM!
No, this only rarely could be a
lymph node and it has hardly anything to do with
sinus infections...
Well, If I were your treating Doctor for this case of shin lump, I would come up with three possibilities, these include:
1. a bursa or collection of thin pus/
synovial fluid due to some irritative pathology!
2. The second possibility is of benign and simple conditions like
lipoma or neurofibroma; there is nothing to worry about these!
3. The last possibility is of sebaceous cyst or some other cysts like parasitic cyst!
I suggest you to go for an FNAC and
ultrasound of the lump for confirmation and to relieve your concerns!
Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.
Wishing you good health.