My brother took treatment for typhoid, malaria,pulmonary TB, within 2 yrs all this happened, so he started getting acidity problem. Then had history of steven johnson syndrome due to sulpha allergy in 2001 took for otorrohea. since then every year he has apthous stomatitis, where he suffers for 2 weeks, but now he is suffering from 3 weeks. help me which investigations i should be doing? also which treatment? what is the diagnosis? Thanx