A potentially defective part has caused the makers of the EpiPen to recall 13 lots of the regular and children's version of the product.

The U.S. Food and Drug Administration announced the recall last week for the allergic reaction treatment. According to the FDA, there have only been a "small" number of defective products reported.

Mylan, the maker of EpiPen said the potential defect could "make the device difficult to activate in an emergency." While the defects have only applied to one lot of the product, the company said the recall was being expanded, "as a precautionary measure out of an abundance of caution."

The EpiPen and EpiPen Jr. lots being recalled were distributed between December 17, 2015 and July 1, 2016. They have been identified as:

US Food and Drug Administration

The company is encouraging customers with concerns to call 1-800-796-9526 or email customer.service@mylan.com.

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