US cosmetic and toiletry sales rose 3.4% last year, driven by gains from both multinationals and niche players, according to a new study by Kline & Company, Parsippany. But it is the biggest companies making the most gains and hungry for more. Procter & Gamble, remains the industry leader, but its share is being challenged across multiple categories by L’Oréal, Estée Lauder and others, according to Kline. Meanwhile, smaller companies are holding their own and garnering the attention of...