HI,Welcome to HCM.
Based on the facts of your query,You seem to have
Varicose lump just below knee,as you noticed accidentaly(meaning its painful lump),while lately you have been doing zumba,which has added
stress to the muscles in the leg compartment,which lead to this painless lump,due mostly to compromised Venus valve function of the Short Saphenous System.
Doppler study of the leg veins would confirm its cause.
Primary examination by a Surgeon and
Second opinion from Vascular Surgeon would confirm the treatment for it.
Hope this would help you to plan its treatment with your doctor.
Welcome for any further query in this regard
Will appreciate writing your feedback review comments,to help the needy patients like you at HCM.
Good Day!!
Dr.Savaskar,
Senior Surgical Specialist
M.S.Genl-CVTS