Universal acquired melanosis (UAM) is a skin condition characterized by hyperpigmentation that occurs as a result of a disorder of pigment metabolism in the skin. The disease is caused by the loss of normal regulation of melanocytes, which leads to abnormal formation of melanin. UAM differs from other forms of melanosis in that its manifestations are not dependent on ultraviolet radiation and can occur in various areas of the skin, such as the face and extremities. Another important feature is that it is not transmitted from person to person. The disease can manifest itself in the form of various pigmented lesiones, often having an asymmetrical shape and irregular edges.
History of the disease and interesting historical facts
Acquired melanosis was first described in scientific literature in the late 19th century, but its diagnosis and understanding of the mechanism of its occurrence have undergone significant changes over the past centuries. Research conducted by scientists such as M. L. Gettelman and E. L. Hirsch helped to understand the morphological nature of this disease. In the 1920s, with the development of dermatopathology, the study of the causes and clinical manifestations of UPM became more thorough. One of the interesting facts is that at the beginning of the 20th century, most cases of melanosis were associated exclusively with age and solar activity, but with the advent of molecular genetic methods, it became obvious that genetic predisposition plays a much more important role in pathemia.
Epidemiology
The epidemiology of universal acquired melanosis shows some statistical trends. According to various publications, the incidence in men and women is approximately the same, but in certain ethnic groups it varies significantly. According to statistics, about 7–9% of the population may have manifestations of melanosis to varying degrees. UAM is most often found in people over 40 years of age, but cases of occurrence in younger people have also been described. It is reported that in people with dark skin, preexisting risk factors are rarely observed, in contrast to groups with lighter skin. According to studies, up to 30% of patients with melanocytic shocks have concomitant disorders.
Genetic predisposition to this disease
Universal acquired melanosis is associated with certain genetic changes that affect melanocytes and the regulation of their activity. One of the key genes involved in the development of melanosis is the MITF (Microphthalmia-associated Transcription Factor) gene, which is responsible for the production of melanin. Mutations in this gene can lead to a disruption in the regulation of pigmentation. In addition, other genes have been identified, such as TYR (Tyrosinase), which is involved in the synthesis of melanin, as well as genes responsible for protection against oxidative stress. Genetic factors in combination with the environment may create a predisposition to the development of the disease, but further research is needed to fully understand the mechanisms.
Risk factors for the development of this disease
The main risk factors associated with the development of universal acquired melanosis are:
- Physical factors: prolonged exposure of the skin to ultraviolet rays, especially in the absence of sunscreen.
- Chemicals: Exposure to certain toxic substances, including certain drugs such as chemotherapy drugs and photosensitizers.
- Other factors include age, hormonal changes, underlying skin conditions (eg, vitiligo), and the presence of singing conditions (eg, psoriasis).
- Family history of melanosis: the presence of similar diseases in close relatives significantly increases the predisposition.
Diagnosis of this disease
Diagnosis of universal acquired melanosis is based on clinical manifestations, as well as additional studies.
Major symptoms may include:
- The appearance of unevenly colored spots on the skin.
- Possible increase in the number of pigmented lesions.
- Changes in the texture of the skin around pigmented areas.
Laboratory tests may include:
— Dermoscopy to assess the characteristics of pigmented lesions;
— Skin biopsy for morphological examination.
Radiological studies may be used to assess the extent of the melanomatous process. Other diagnostics may include molecular genetic testing to determine genetic predisposition. Differential diagnosis is important to exclude other conditions such as melanoma or various dermatoses.
Treatment
Treatment of universal acquired melanosis depends on the clinical picture and severity of the disease.
General treatment may include:
- Avoiding risk factors such as sun exposure.
- Use of sun protection products.
- Improving the overall condition of your skin with moisturizers.
Pharmacological treatment may include:
— Corticosteroids to reduce inflammation;
— Drugs aimed at correcting hyperpigmentation, such as hydroquinone.
Surgical treatment may be indicated in cases of significant growth or malignant transformation of the formations. Other treatments may include laser therapy and phototherapy to correct pigmentation.
List of medications used to treat this disease
Among the drugs used to treat universal acquired melanosis are:
- hydroquinone
- Bark and extracts of various plants with a whitening effect
- Corticosteroids (eg, betamethasone)
- Laser preparations for the treatment of pigmented lesions
- Topical retinoids
Disease monitoring
Disease monitoring includes regular clinical examinations and skin assessments. Monitoring steps may include:
- Regular visits to a dermatologist to assess the dynamics of the condition.
- Repeat dermatoscopic examinations at regular intervals.
- Monitoring for new melanoma lesions.
The prognosis for most patients with universal acquired melanosis is generally good. However, some patients may experience malignant transformation, which highlights the importance of careful monitoring and early diagnosis of complications.
Age-related features of the disease
Universal acquired melanosis may manifest itself differently depending on the age group. In adolescents and young adults, the disease may be observed less frequently and in a mild form, while in older people, the manifestations of melanosis become more pronounced and often accompany other skin changes. It is important to remember that in older people, the risk of skin lesions transforming increases, and more careful monitoring is necessary.
Questions and Answers
- What is universal acquired melanosis?
Universal acquired melanosis is a form of hyperpigmentation characterized by the presence of asymmetrical and unevenly colored lesions on the skin that occurs without exposure to sunlight. - What are the main symptoms of melasma?
The main symptoms include the appearance of uneven pigment spots, changes in skin texture and a possible increase in the number of pigmented lesions. - How is universal acquired melanosis diagnosed?
Diagnosis is based on clinical manifestations, dermatoscopy, possible skin biopsy and molecular genetic testing. - What are the risk factors associated with the development of this disease?
The main risk factors are age, exposure to ultraviolet radiation, certain chemicals, and genetic predisposition. - How is melanosis treated?
Treatment includes skin care, pharmacological agents, and in complex cases, surgery or laser therapy.
