John Cena has talked publicly about being diagnosed with skin cancer, specifically melanoma, on two separate occasions.
Type of cancer
John Cena has said he was diagnosed with skin cancer, reported as melanoma, with cancerous spots found on his chest and later on his upper back/shoulder area. The spots were removed during dermatology procedures, and reports describe him as having overcome the skin cancers after treatment.
Current situation
Recent coverage describes his skin cancers as past diagnoses that were treated, not as an ongoing advanced cancer battle. He has used the experience to promote sun protection and regular skin checks, especially encouraging men to use sunscreen and see dermatologists.