These recurrent ulcers appear on movable mucosa. They are discrete, round-to-oval ulcers that are 3 to 5 mm in diameter and exhibit a yellowish-white fibrin center surrounded by an erythematous halo.
A) Major aphthous ulcers
B) Sutton disease
C) Herpetiform aphthous ulcers
D) Minor aphthous ulcers
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