Involves the nonkeratinized epithelium (especially labial and buccal mucosa)
Begins as erythematous macule that ulcerates and forms a central fibropurulent eschar
Lesions measure from 2-3mm to several cm in diameter
Aphthous stomatitis
Angioedema
Chancroid
Chlamydia conjunctivitis
Herpes gingivostomatitis
Gonorrheal conjunctivitis
Herpes labialis
Impetigo