Lichen planus seldom appears on the lips and when it does usually the lower and not the upper is affected, and the eruption is almost always accompanied by lichen planus in the cheek pouches, a distinct aid in diagnosis.1 The disease in this situation has several interesting peculiarities. For instance, although lichen planus is definitely papular, papules seldom appear on the lips. Furthermore, the exposed red is a semimucosa and is corneous, while the covering of the inner surface is similar to that lining the rest of the mouth and is not corneous. This causes a dissimilarity of the eruption in these two closely approximated surfaces. The confusion arising from this and other circumstances will be best elucidated by a discussion of individual cases.
REPORT OF CASES
The patient (fig.) was a strong, well built man, aged 68, who led an outdoor life. He was nervous,
MONTGOMERY DW. LICHEN PLANUS OF LIPS. Arch Derm Syphilol. 1938;38(3):401–404. doi:10.1001/archderm.1938.01480150075011
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