Thanks Kerri. Biospy is not an option for now as RO is concerned about healing as it is just 7 weeks since last radiation dose. He want to wait for 3 months to be certain that it is not any radiation side-effect. I am just trying to console him by reminding him of previous time (he had same issue 2 years back, it took over 3-4 months for tongue ulcer to heal).

By the way, the antibiotic has relieved him of under ear pain.