Recently, more scammers have been using iTunes as a disguise to make fraudulent purchases. According to financial site MoneyTips, the charge looks something like this: "APL*ITUNES.CON/BILL 866-712-7753 CA."
The majority of the charges start out small (so small, the cardholder likely won't notice them at first glance).
When you detect a charge that looks like the one above, MoneyTips recommends checking your purchase history under the Apple account linked to the card in question to see if they add up.