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: Surgery
Pulp space infection painful due to? 
Select and explain. 
A. Dense fibrous septae, B. Small phalynx, C. Rich blood supply, D. Rich nerve supply
A: Dense fibrous septae
Answer: A: Dense fibrous septae 
Explanation: Ans. is 'a' i.e., Dense fibrous septae Pulp space infection (felon) Pulp space infection with pus trapped between the specialised fingeip septae causes intense fingeip pain. It may lead to terminal phalangeal bone infection, erosion and sequestrumformation.The last of these will need to be drained and debrided. A common differential diagnosis with small vesicles and crusts is the self-resolving herpetic whitlow, especially in dental workers, caused by the herpes simplex virus.