The Nasdaq Composite Index has skyrocketed more than 30% so far this year, and the S 500 is up close to 20%. Meanwhile, the Dow Jones Industrial Average has gained less than 5%.

Last month was especially troublesome for the blue chip index. But problems often present opportunities. Is it time to buy the Dow Jones' three worst-performing August stocks?

Walgreens Boots Alliance (NASDAQ: WBA) shares fell more than 14% in August. This only added to investors' misery. The pharmacy stock sank 28% last year and had already tumbled close to 20% year to date by the end of July.

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Source Fool.com