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Postherpetic neuralgia (PHN) is neuropathic pain that occurs due to damage to a peripheral nerve caused by the reactivation of the varicella zoster virus (herpes zoster, also known as shingles). Typically, the nerve pain (neuralgia) is confined to an area of skin innervated by a single sensory nerve, which is known as a dermatome. PHN is ...
Shingles, also known as herpes zoster or zona, [6] is a viral disease characterized by a painful skin rash with blisters in a localized area. [ 2 ] [ 7 ] Typically the rash occurs in a single, wide mark either on the left or right side of the body or face. [ 1 ]
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Herpes gladiatorum is a skin infection primarily caused by the herpes simplex virus. The virus infects the cells in the epidermal layer of the skin. The initial viral replication occurs at the entry site in the skin or mucous membrane. [7] The infections caused by a HSV Type 1 virus may be primary or recurrent. [8]
Wound healing refers to a living organism's replacement of destroyed or damaged tissue by newly produced tissue. [1] In undamaged skin, the epidermis (surface, epithelial layer) and dermis (deeper, connective layer) form a protective barrier against the external environment. When the barrier is broken, a regulated sequence of biochemical events ...
Damaged sweat and sebaceous glands, hair follicles, muscle cells, and nerves are seldom repaired. They are usually replaced by the fibrous tissue. The result is the formation of an inflexible, fibrous scar tissue. Human skin cells are capable of repairing UV-induced DNA damages by the process of nucleotide excision repair. [2]
It causes chickenpox (varicella) commonly affecting children and young adults, and shingles (herpes zoster) in adults but rarely in children. As a late complication of VZV infection, Ramsay Hunt syndrome type 2 may develop in rare cases. VZV infections are species-specific to humans. The virus can survive in external environments for a few hours.
[25] [26] It has been theorized that this is due to damage to the spinal trigeminal complex. [27] Trigeminal pain has a similar presentation in patients with and without MS. [28] Postherpetic neuralgia, which occurs after shingles, may cause similar symptoms if the trigeminal nerve is damaged, called Ramsay Hunt syndrome type 2.