In addition, the appearance patent is only related to the aesthetic appearance of the product seen by the naked eye, and has nothing to do with the internal structure.
On the other hand, if you have a utility model patent for internal structure and he applies for an appearance patent, then: if the internal structure of the product he made is consistent with your patent, it will infringe your utility model patent, and if the appearance of the product you made is consistent with his appearance patent, you will infringe someone else's appearance patent.