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If this change / discoloration/ tenderness / has come on suddenly then I would have concern that you might have a problem with a blood clot of the leg ( DVT) that if the case then that would be very serious ...
If the calf has swollen become painful then I advise get checked at ER now ...they may check a blood test -- D-dimer -- that screens for abnormal clotting activity
They may check the big vessels of the leg for clot and normal flow ..Doppler ultrasound
If just a varicose vein than that is not serious ...The vein should be soft and easily compressed
The calf should not be swollen or sore/ tender
I hope that this information is helpful for you
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Thank you and Best Regards,
Anthony Bray MD