No.

Lychee is a wild fruit that is edible and non-toxic. Mountain lychee has some medicinal value, which can clear away heat, detoxify, diuretic, aid digestion, and sterilize. After the fruit is dried, it can also be crushed into powder and used as medicine. This powder can effectively expel roundworms and stop bleeding, and is suitable for treating diseases such as food accumulation, hepatitis, jaundice, ascariasis and traumatic bleeding. In addition to being eaten directly, mountain lychees can also be processed into various foods. Therefore, you can safely eat mountain lychee, it is safe and non-toxic.