Polymorphic light eruption (PLE) is a dermatological disorder characterized by the development of skin rashes in response to sunlight. Clinically, PLE manifests itself as various types of erythematous elements, which may be accompanied by itching and discomfort. Typically, the rash occurs in areas exposed to sunlight, such as the face, neck, hands, and décolleté. PLE is most often observed in women aged 20 to 50 years, although it can also occur in men, as well as in people of different ages and ethnicities. This disease is characterized by the possibility of relapses, which often occur in the spring and summer, when the level of solar activity increases.
History of the disease and interesting historical facts
The history of polymorphic light eruption has interesting aspects. Initially, the description of the disease can be found in the works of classical scientists, but a systematic understanding of PSI began only in the 20th century, with the development of dermatology as a science. It is known that the term "polymorphic light eruption" was introduced to designate a group of dermatological disorders that occur under the influence of ultraviolet radiation. In the 1930s, the first scientific publications describing the clinical manifestations of PSI appeared, and starting from the 1970s, researchers began to pay more attention to the pathogenesis and methods of treatment of this disease. Interestingly, PSI remained an underestimated condition for a long time, and only in recent decades has its clinical and molecular characteristics been actively studied.
Epidemiology
The epidemiology of polymorphic light eruption emphasizes that this disease is quite common. According to various data, the incidence of PLI varies from 10% to 30% among people systematically exposed to sunlight. A special risk group is made up of people with a predisposition to solar dermatoses, in particular, those with fair skin and a history of photosensitivity. According to studies, among residents of areas with high levels of solar radiation, such as tropical and subtropical zones, the frequency of PLI can reach 50% and more. It is important to note that the development of the disease can be associated not only with solar radiation, but also with the effects of certain drugs and chemicals, which makes the epidemiological situation diverse.
Genetic predisposition to this disease
Genetic predisposition to polymorphic light eruption is well studied. Several genes have been shown to play a key role in the development of this condition. In particular, mutations in genes involved in the cellular response to DNA damage and oxidative stress may be associated with an increased predisposition to PJI. The most studied is the polymorphism in the TNF-α gene, which regulates inflammatory processes in the skin. Studies show that certain alleles of this gene may increase the risk of developing PJI in susceptible individuals. In addition, some studies highlight a link between candidate genes associated with skin photodamage and clinical manifestations of PJI.
Risk factors for the development of this disease
There are many risk factors that contribute to the development of polymorphic light eruption. These include:
- Physical factors:
- Long exposure to the sun
- Ultraviolet radiation, including solariums
- Chemical factors:
- Certain medications (eg, tetracycline and sulfonamides)
- Photosensitizing agents in cosmetic products
- Other factors:
- Past infections
- Conditions that weaken the immune system
- Stressful situations and disorders of psycho-emotional state
Diagnosis of this disease
Diagnosis of polymorphic light eruption is primarily based on clinical examination, as well as additional examination methods. The main symptoms of this disease include:
- Erythematous skin rashes that may be papular or vesicular
- Itching and burning in the area of the rash
- Exacerbation of symptoms after sun exposure
Laboratory tests may include tests for UV sensitivity and allergy testing. Radiologic tests may be ordered to rule out other causes of dermatological disorders. The differential diagnosis includes conditions such as solar dermatitis, polymorphic light dermatosis, as well as eczema and psoriasis, which requires a careful approach to each clinical case.
Treatment
Treatment of polymorphic light eruption should be comprehensive and individual. The main treatment areas include:
- General treatment:
- Reduce time spent in the sun, use protective clothing
- Systemic hygiene and skin care
- Pharmacological treatment:
- Using antihistamines to relieve itching
- Corticosteroid ointments to reduce inflammation
- Surgical treatment:
- In rare cases, if complications arise or a conservative approach is ineffective, surgical intervention may be considered to remove the affected areas of skin.
- Other types of treatment:
- Phototherapy (UV therapy) to reduce skin sensitivity
- Immunotherapy for patients with recurrent disease.
List of medications used to treat this disease
The most commonly used medications for polymorphic light eruption include:
- Antihistamines (eg, cetirizine, loratadine)
- Corticosteroid creams (hydrocortisone, betamethasone)
- Immunomodulators (tacrolimus, pimecrolimus)
- Photosensitizing drugs for phototherapy (mainly used in clinical practice)
Disease monitoring
Monitoring of polymorphic light eruption includes regular examinations by a dermatologist, as well as self-assessment of the skin condition by the patient. Control stages should include:
- Evaluation of the frequency and severity of relapses
- Analysis of the effectiveness of the treatment
- Identification of possible trigger factors for exacerbation of the disease
The prognosis with proper treatment is usually good, but complications such as secondary skin infection or worsening of the condition may develop if not properly monitored.
Age-related features of the disease
Polymorphic light eruption may manifest itself differently depending on the age group. Young people are more likely to have acute forms of the disease, while in older people the clinical manifestations may be less pronounced due to changes in skin reactivity. In children, PSI usually occurs less aggressively, but their high sensitivity to the sun requires increased levels of protection.
Questions and Answers
- What are the main symptoms of a polymorphic luminous eruption?
The main symptoms include erythematous rash, itching and burning that occur after sun exposure. - How can a polymorphic luminous eruption be diagnosed?
Diagnosis is based on clinical examination, laboratory tests and differential diagnosis with other skin diseases. - How is polymorphic light eruption treated?
Treatment includes general, pharmacological and possibly surgical intervention, as well as phototherapy in selected patients. - Is there a genetic predisposition to polymorphic light eruption?
Yes, some genetic mutations, such as polymorphisms in genes responsible for response to UV radiation, may increase the risk of developing the disease. - What is the prognosis and possible complications of this disease?
The prognosis with adequate treatment is usually good, but complications such as skin infections or relapses of the disease may occur.
