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Actinomycetoma is a chronic bacterial subcutaneous infection caused by Actinomyces that affect the skin and connective tissue. It is, therefore, a form of actinomycosis. Mycetoma is a broad term which includes actinomycetoma and eumycetoma under it. However, eumycetoma is caused by fungal infection in contrast to actinomycetoma that is caused by mostly anaerobic bacteria.
References
Viguier, Manuelle; Lafaurie, Matthieu (15 January 2015). "Actinomycetoma". New England Journal of Medicine. 372 (3): 264. doi:10.1056/NEJMicm1316013. PMID25587950.
Arenas, Roberto; Fernandez Martinez, Ramón F.; Torres-Guerrero, Edoardo; Garcia, Carlos (2017). "Actinomycetoma: an update on diagnosis and treatment". Cutis. 99 (2): –11–E15. ISSN2326-6929. PMID28319638.