Hello! Thank you for the query. Most common skin cancer (Carcinoma Basocellulare) is very different than other cancers. It has very high level of survivals, grows really slowly and extremely rare gives metastases. That is why, the only thing which should be done with it is to remove it completely. So even if the pathological result will be cancer, most likely nothing else will be done with it and the treatment will be over. However, if this lesion were mole-like and they do think it might be Melanoma Malignum, than your son will going to need surrounding tissues removal and local lymph nodes removal. Hope this will help. Regards.