We present 2 cases of severe erosive stomatitis. The first case involv
es the rare association of an extensive, erosive lichen planus with a
Castleman's tumor. The second case involves the association of lichen
planus pemphigoides with severe, obstructive lung disease (bronchiolit
is obliterans). We believe that in both cases the conjunction of these
conditions is not fortuitous but perhaps due to an underlying immune
dysfunction. With patients presenting a severe, therapy-resistant, ero
sive stomatitis, one should be alerted to the possibility of immunolog
ical diseases and/or tumors.