Hello and welcome to HCM,
A history of knot like structures on the knee which shrink and re-appear, and are painful is most probably suggestive of some vascular disease
process. like varicose veins
Scar tissue is unlikley to shrink and reappear at intervals.
You need to get some investigations to know the cause of such swellings.
of the leg is required to know the origin of the lesion.
If it turns out to be due to dilatation of the veins, further doppler needs to be done.
Consult your doctor for clinical examination, investigations and management.
Thanks and take care
Dr Shailja P Wahal