Thrush occurs as white patches surrounded by erythematous tissue ...

[darbym82]

Thrush occurs as white patches surrounded by erythematous tissue in oral mucosa. The microorganism that causes this is:
 
  A. Candida
  B. Herpes simplex I
  C. Coxsackie virus
  D. Herpes zoster

Question 2

The following disorder commonly presents with vesicular or ulcerated lesions with a yellow base on the oral mucosa and lips.
 
  A. Aphthous ulcer
  B. Herpes simplex I
  C. Coxsackie viral infection
  D. All of the above

[sarajane1989]

Answer to Question 1

ANS: A
Candidal infections of the oral mucosa take several forms. Thrush, or pseudomembranous candida, results in white patches, or plaques, overlying a very red base. Erythematous candida results in erythematous lesions and, on occasion, ulcerative lesions. Angular stomatitis results in lesions at the corners or angles of the mouth. The amount of associated pain is variable.

Answer to Question 2

ANS: A
Aphthous ulcers are painful and usually small (less than 1 cm). The ulcer is shallow, surrounded by erythema and mild edema. The base of the ulcer is pale yellow or gray. Orolabial ulcers are often caused by herpes simplex type 1 virus. The ulcers are typically preceded by a prodromal phase of tenderness, followed by edema at the site where an individual or cluster of vesicles forms and progresses to ulceration. The prodromal phase may also include fever. Hand-foot-and-mouth disease is caused by a coxsackievirus. Painful skin and oral lesions are often preceded by a period of malaise and fever. The patient often presents once the lesions appear on the lips and/or oral mucosa. The lesions erupt as vesicles, which later ulcerate.

[darbym82]

TYSM

[scikid]

Gracias!