very big visible veins on my legs

Hi everybody,
The veins on my legs are very visible. I don't like it because they pop up so much that I am embarassed to wear skirts somethimes. They are not unhealthy veins, but it's just that I don't like how it looks. They especially pop up when it's hot or when I work out. I was wondering if there's a cream or something that keeps my body cool. Or if anyone knows of anything else that could help I would appreciate......
Thanks!
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