Pyomyositis is an infection of the skeletal muscle, occurring infrequently and to a lesser extent in the neck muscles. This paper presents the case of a 19-year-old Ecuadorian male living in Colombia; he was diagnosed with pyomyositis stage 2 in the right sternocleidomastoid muscle, with little systemic involvement. An echography and computer tomography documented an abscess. He was treated conservatively with just antibiotics (clindamycin and gentamicin), without abscess drainage, leading to good progress and resolution of the illness. This paper presents a general review of pyomyositis, cases reported to date in Colombia and the world, specifically regarding the neck and sternocleidomastoid muscle. The sternocleidomastoid muscle is most frequently involved in the neck; the first report of a case in Colombia was published in 1990 and Staphylococcus aureus has been the most frequent pathogen, although other Gram-Positive Cocci and Enterobacteriaceae have also been involved.