By Gary M. White, MD
There are many entities that can cause the presence of a chronic red plaque or plaques. Below are the most common.
Lupus Erythematosus. Lupus occurs most commonly on the sun exposed areas.
Polymorphous Light Eruption. Both PMLE and lupus occur always in sun-exposed areas.
Jessner Lymphocytic Infiltrate
Leukemia Cutis--Especially in Kids
Morphea Central clearing or a whitish center is common.
AESOP Syndrome Solitary large red patch or plaque of months duration. This is caused by an underlying plasmocytoma. Look also for adjacent lymphadenopathy.