A 2022 systematic review brought together evidence from 11 studies that compared dressings and topical agents for treating open wounds after surgical treatment for pilonidal sinus of the buttocks. The authors concluded that: platelet rich plasma may help wounds to heal quicker compared to sterile gauze; Lietofax skin repair cream may help wounds to heal by 30 days compared to iodine (which helps to reduce bacteria in the wound); but it is not clear whether hydrogel dressings (designed to keep the wound moist) reduce the time it takes wounds to heal compared with cleaning the wound with iodine. Etymology
Pilonidal means nest of hair and is derived from the Latin words for hair (pilus) and nest (nidus). The condition was first described by Herbert Mayo in 1833. R.M. Hodges was the first to use the phrase pilonidal cyst to describe the condition in 1880.The condition was widespread in the United States Army during World War II. The condition was termed "Jeep seat" or "Jeep riders disease", because a large portion of people who were being hospitalized for it rode in Jeeps, and prolonged rides in the bumpy vehicles were believed to have caused the condition due to irritation and pressure on the coccyx. References
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NHS Choices for pilonidal sinus treatment
If the erythema ab igne lesions demonstrate pre-cancerous changes, the use of 5-fluorouracil cream has been recommended. Abnormally pigmented skin may persist for years. Treatment with topical tretinoin or laser treatment may improve the appearance. Epidemiology
Erythema ab igne was once commonly seen in the elderly who stood or sat closely to open fires or electric heaters; however, erythema ab igne has been reported in both young and elderly individuals. Women have a higher incidence of erythema ab igne than men. Although wide use of central heating has reduced the overall incidence of erythema ab igne, it is still sometimes found in people exposed to heat from other sources such as heating pads, space heaters, hot water bottles, and electronic devices. References
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DermNet vascular/erythema-ab-igneNew England Journal of Medicine Image Challenge