Aggressive put buying is taking place in thinly traded health product maker Chattem today. Shares near $67.44 and an opening customer buyer has been lifting March 60 Puts, paying from 1.85 to 2.15 in small lots totaling 620 contracts. Shares sank nearly 10% early yesterday on earnings, before a bounce and close at 66.63. Today’s flow suggests concern for further volatility and downside potential in the short term.