Can cosmetics from asia sold in france contain lead? Or should I wait and buy them back in the usa?

It depends. If you just need a lipstick for your big night in paris, it probably won't harm you to buy a tube, but if you're planning to buy a gross to bring back to the states, you might want to reconsider. Even cosmetics bought in the usa may not be safe as not everything imported can be inspected and it's too easy to conceal the country of origin on some products. Bottom line, know your sources!