Skin
Leiomyomas of the skin are generally (1) acquired, and (2) divided into several categories:
Solitary cutaneous leiomyoma
Multiple cutaneous (or pilar) leiomyomas arising from the arrectores pilorum muscles
Angioleiomyomas (vascular leiomyomas) that are thought to arise from vascular smooth muscle
Dartoic (or genital) leiomyomas originating in the dartos muscles of the genitalia, areola, and nipple
Angiolipoleiomyoma

Esophagus, stomach and small intestines
Leiomyoma is the most common benign mesenchymal tumor of esophagus and second most common benign tumor of the small bowel (with gastrointestinal stromal tumor as most common). Although leiomyoma is the most common benign esophageal tumor, malignant carcinoma is still 50 times more likely. Approximately 50% of cases are found in the jejunum, followed by the ileum in 31% of cases. Almost one half of all lesions are less than 5 centimeters. Other locations, metastatic leiomyoma
Metastatic leiomyoma are an extremely rare complication after surgery to remove the uterus for uterine fibroids. The most frequent sites of occurrence are the lungs and pelvis. The lesions are hormonally responsive. Fibromyoma of the breast is an extremely rare benign breast neoplasm. Most reports in literature mention a history of hysterectomy for uterine fibroids, although the question of whether these fibromyomas are possibly metastases of the uterine fibroids has not been investigated. An alternative hypothesis is an origin from the smooth muscle of the nipple. Leiomyoma may spontaneously occur in any muscle. Depending on the location of the tumor, identification may not be timely until overall mass becomes undeniably noticeable. The symptoms for a 30-year-old male with a 10 cm leiomyoma included "dead leg" pains.
Pyomyositis is a bacterial infection of the skeletal muscles which results in an abscess. Pyomyositis is most common in tropical areas but can also occur in temperate zones. Diagnosis
Diagnosis is done via the following manner:
Pus discharge culture and sensitivity
X ray of the part to rule out osteomyelitis
Creatinine phosphokinase (more than 50,000 units)
MRI is useful
Ultrasound guided aspiration

Treatment
The abscesses within the muscle must be drained surgically (not all patient require surgery if there is no abscess). Antibiotics are given for a minimum of three weeks to clear the infection. Epidemiology
Pyomyositis is most often caused by the bacterium Staphylococcus aureus. The infection can affect any skeletal muscle, but most often infects the large muscle groups such as the quadriceps or gluteal muscles.Pyomyositis is mainly a disease of children and was first described by Scriba in 1885. Most patients are aged 2 to 5 years, but infection may occur in any age group. Infection often follows minor trauma and is more common in the tropics, where it accounts for 4% of all hospital admissions. In temperate countries such as the US, pyomyositis was a rare condition (accounting for 1 in 3000 pediatric admissions), but has become more common since the appearance of the USA300 strain of MRSA.Gonococcal pyomyositis is a rare infection caused by Neisseria gonorrhoeae. Additional images
References

Maravelas R, Melgar TA, Vos D, Lima N, Sadarangani S (2020). "Pyomyositis in the United States 2002-2014". J Infect. 80(5):497-503. doi:10.1016/j.jinf.2020.02.005. PMID 32147332. == External links ==