This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
False statement about impetigo – 
Select and explain. 
A. Mostly caused by staphylococcus or streptococcus or both, B. It predisposes to glomerulonephritis, C. Produces scar on healing, D. Erythromycin is drug of choice
C: Produces scar on healing
Answer: C: Produces scar on healing 
Explanation: Impetigo is a highly contagious (infectious) Gram-positive bacterial infection of the superficial layer of the epidermis. It occurs in two forms :-


Impetigo contagiosa (Non-bullous) → Caused by both staph aureus & streptococcus (group `A )
Bullous impetigo Caused by Staph.aureus.


Lesions of Impetigo contagiosa heal without scarring.
For treatment of Impetigo contagiosa, Systemic Erythromycin is given to cover and Staphylococcus Streptococcus. 
Glomerulonephritis may occur after streptococcal skin (e.g. impetigo, ecthyma) or throat infection, whereas rheumatic fever can develop only after throat infection (not skin infection). Therefore, Impetigo can cause glomerulonephritis but not rheumatic fever.