Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. We will try to help you in best way possible. First of all it s sad to know what you had been going through lately. Based on the history you have shared, though chemotherapy is related to side effects but delaying treatment for squamous cell carcinoma isn t advisable at all. As metastatisis or spread to other parts will make it difficult to be cured. The chemotherapy ma cause decreased immunity and hence Increased chances of infection as you mentioned but adding adequate cover for infection control with antibiotics or anti fungal if needed will help and dermatologist review in that regard should be preferred. Hope I have answered your query. Let me know if I can assist you further.