Keywords: CSCC, cutaneous squamous cell carcinoma; HLP, hypertrophic lichen planus; KC, keratinocytic cancer; LN, lymph node; PD, programmed death; PD-1; PD-1 inhibitor; cutaneous immune-related adverse event; cutaneous toxicity; hypertrophic lichen planus; hyponatremia; lichen planus; lichenoid; lymph node; metastasis; programmed death-1; squamous cell carcinoma; treatment.