PD-1, programmed cell death 1; PD-L1, programmed cell death ligand 1; CTLA-4, cytotoxic T-lymphocyte-associated protein 4.
The rash treatment was as follows: 1, only topical steroids or systemic antihistamines; 2, systemic steroids (<0.4 mg/kg prednisolone) and/or topical steroids; 3, systemic steroids (0.4–1.0 mg/kg prednisolone) and/or topical steroids; 4, systemic steroids (>1.0 mg/kg prednisolone) and/or topical steroids