As far as I know, Guangdong Baiyun Mountain freckle mask is not fake. This product is produced by Guangzhou Baiyun Mountain Medical Science and Technology Development Co., Ltd., which is a regular and legal product. However, it should be noted that everyone's skin condition is different, and the use effect will be different, so it is best to consult a professional doctor before use.

In addition, some consumers have reported that the whitening effect of this product is not lasting enough, and it may rebound after a period of use. At the same time, some consumers also reported that the price of this product is high and the cost performance is average.

To sum up, Guangdong Baiyun Mountain freckle mask is not fake, but the use effect varies from person to person. It is recommended to carefully understand the product information and user feedback before buying.