Possibility of recurrence of varicose veins?

I had a sclerotherapy for varicose veins once. Is recurrence possible?

What will happen to the nose? As someone who has experienced it once, I understand the uncomfortable feeling and pain. I'm both curious and scared about what might happen if it recurs again. Since the treatment process starts from the beginning, I wonder what the best way to manage it is. I'm also curious about management methods according to seasons and environmental factors.