Pityriasis lichenoides et varioliformis acuta (PLVA) is a rare skin disease characterized by the appearance of inflammatory papules that develop into vesicles and crusts. The disease usually manifests itself acutely and can be associated with immune-allergic mechanisms, infections or reactions to drugs. Clinically, PLVA can present as multiple small spots located on the trunk and limbs, sometimes accompanied by itching. These elements are initially red or brown in color and then become covered with crusts, which can resemble smallpox. It is important to note that such morphology of the rash requires differential diagnosis with other dermatoses.
History of the disease and interesting historical facts
Pityriasis lichenoides is thought to have been first described in the early 20th century, but its history of medical observation goes back even further. In the 1930s, researchers began actively observing and describing cases of the disease, which contributed to the accumulation of data on its clinical manifestations, possible triggers, and course. Interestingly, for decades, PLVA remained relatively poorly understood and often misdiagnosed. In some cases, it was differentiated from other skin diseases based on the appearance of the papules. In the 1970s, the connection between PLVA and infections attracted the attention of specialists, which opened up new horizons for the study of pathogenesis.
Epidemiology
According to the latest data, Pityriasis lichenoides et varioliformis acuta is quite rare, although the exact statistics on its prevalence remain uncertain. According to various sources, the incidence is 0.5-2 cases per 100,000 people per year. The pathology is observed in both men and women, but some studies indicate a higher predisposition of men to this condition. The disease usually manifests itself between the ages of 10 and 30, although cases are possible at a later age. Isolated manifestations of the disease in children are also known.
Genetic predisposition to this disease
At present, scientific research has not identified specific genes directly associated with the development of Pityriasis lichenoides et varioliformis acuta. However, studies show that mutations in genes responsible for the regulation of the immune response may play a role in predisposition to this disease. The possibility of the participation of carriage of certain genetic markers, which may indicate a predisposition to PLVA, is discussed. It is important to note that diseases such as PLVA can develop against the background of hereditary immune disorders.
Risk factors for the development of this disease
There are several risk factors that may contribute to the development of Pityriasis lichenoides et varioliformis acuta:
- Viral infections, such as Epstein-Barr virus infection.
- Immune disorders.
- Autoimmune diseases or associated dermatoses.
- Allergic reactions to medications.
- Stressful situations that can provoke or aggravate the course of the disease.
Thus, it can be noted that PLVA can be associated with many factors, including both infectious and non-infectious triggers.
Diagnosis of this disease
Diagnosis of Pityriasis lichenoides et varioliformis acuta involves several stages and may require clinical examination, laboratory and instrumental studies. The main symptoms of the disease are the presence of red papules, often with itching, which can turn into vesicles and crusts.
Laboratory tests may include:
- Complete blood count - to detect signs of inflammation.
- Pathological examination of the skin (biopsy) - to confirm the diagnosis and exclude other skin diseases.
Radiological examinations are usually not required. In addition, it is important to conduct differential diagnosis with such conditions as viral dermatoses, various forms of eczema, dermatitis and other acute skin manifestations.
Treatment
Treatment of Pityriasis lichenoides et varioliformis acuta should be comprehensive and depend on the severity of the disease, as well as on associated factors. General approaches to treatment include:
- Pathogenetic therapy is aimed at correcting immune response disorders.
- Pharmacological treatment includes the use of local or systemic corticosteroids, immunosuppressants, and antihistamines to relieve itching.
- Surgical treatment - in rare cases, surgery may be indicated if complications occur.
- Using phototherapy or laser treatment.
A good effect can be achieved by combining local treatment with agents that affect the immune system.
List of medications used to treat this disease
Medicinal products used in the treatment of Pityriasis lichenoides et varioliformis acuta include:
- Corticosteroids (prednisolone, hydrocortisone).
- Immunomodulators (azathioprine, cyclosporine).
- Antihistamines (doxylamine, loratadine).
- Photosensitizers (phototherapy drugs).
Each treatment should be carried out under the supervision of a dermatologist, taking into account possible side effects.
Disease monitoring
Monitoring of the patient's condition with Pityriasis lichenoides et varioliformis acuta includes regular examinations by a dermatologist, as well as an assessment of the dynamics of clinical manifestations. The prognosis is usually favorable, but the disease can be recurrent and, in the absence of adequate therapy, complications such as secondary infection or changes in skin structure may develop.
Age-related features of the disease
Pityriasis lichenoides et varioliformis acuta can occur at any age, but its peak occurs in adolescence and young adulthood. In children, the disease is usually less severe, often more benign, and may resolve without specific treatment. Adult patients are more likely to experience relapses, necessitating closer monitoring and long-term treatment.
Questions and Answers
- What causes Pityriasis lichenoides et varioliformis acuta?
The disease can be caused by various factors, including viral infections, allergic reactions and immune disorders. - What are the main symptoms of the disease?
The main symptoms include itchy red papules that may develop into vesicles and then crusts. - How long does treatment for Pityriasis lichenoides last?
The duration of treatment depends on the severity of the disease, but it often takes several months to achieve complete remission. - Can Pityriasis lichenoides et varioliformis acuta be prevented?
There is no complete prevention, but avoiding known triggers and promptly treating infections can reduce the risk. - What is the likelihood of recurrence of the disease?
Relapses are quite common, especially at a young age and in the presence of concomitant diseases.
