Skin Necrosis: Pathophysiology and innovations in tissue regeneration

Skin, the largest organ in the human body, serves as a crucial barrier against environmental threats. However, larger skin defects or compromised wound healing can result in persistent wounds, sometimes requiring skin substitutes. Skin tissue engineering aims to create materials that can replace skin functions temporarily or permanently. The skin comprises several tissue types, including epithelial, connective, muscular, nervous, and vascular tissues. Keratinocytes, for instance, undergo a specialized process to form the cornified layer, which differentiates from apoptosis, a type of programmed cell death. Pathogenic processes often involve necrosis, a form of tissue death caused by insufficient blood supply, infections, or trauma. There are various types of necrosis, including coagulation, liquefactive, gangrenous, caseous, fat, and fibrinoid necrosis, each defined by the tissue changes and underlying causes. Necrosis can result from external factors like mechanical trauma, thermal damage, or ischemia, and internal factors such as infection or certain diseases. Necrosis is linked to autoimmune conditions, vascular diseases, and toxic exposures. Risk factors include age, alcohol abuse, infections, and conditions like diabetes and HIV. Treatment for necrosis involves removing dead tissue (debridement), managing infections, and restoring blood flow, often requiring surgery or amputation. Additional treatments like antibiotics, hyperbaric oxygen therapy, and wound dressings support healing. Alternative approaches, including homeopathy and Ayurveda, focus on stimulating natural healing processes through herbs and detoxification.