Tar melanosis

Introduction to tar blackness Tarmelanosis, also known as toxic lichenin-like melanin dermatitis, is a localized skin inflammatory and pigmented disease caused by prolonged exposure to tar and its derivatives. basic knowledge The proportion of sickness: 0.01% Susceptible people: no specific population Mode of infection: non-infectious Complications: keratosis

Causes of tar blackening

(1) Causes of the disease

1. Workers exposed to coal tar, petroleum and processed products, are susceptible to women who use crude cosmetics containing such chemicals, and can be aggravated by sunlight.

2. Middle-aged female patients may be associated with neurological and endocrine dysfunction.

(two) pathogenesis

Antimony, phenanthrene, naphthalene have significant photosensitivity, often manifested as photosensitive contact dermatitis.

Tar blackening prevention

Since the disease is clearly related to contact with tar and its products, prevention should be carried out according to its cause. For workers engaged in petroleum processed products, occupational protection should be strengthened to avoid the occurrence of this disease caused by long-term exposure to tar products in an unprotected state. Wear protective clothing, protective masks, protective masks and protective boots to minimize the possibility of contact with refueling products and to effectively reduce the incidence of this disease.

Tar morbid complications Complications keratosis

There may even be obvious precancerous lesions such as hyperkeratosis or epithelioid hyperplasia.

Symptoms of tar blackness Symptoms Common symptoms Loss of appetite, blackheads, acne, rash, fatigue

More common in exposed parts such as cheeks, especially the periorbital and ankle, the back of the hands and forearms, initially inflammatory erythema, edema, often burning and itching, followed by several weeks of persistent erythema and scales, may have Follicular papules and blackheads, after development of grayish gray to dark brown diffuse or reticular pigmentation, if disengaged, the inflammatory response can resolve within a few weeks, pigmentation can be resolved in 1 to 2 years, and follicular blackheads Sustained for many years, if long-term exposure, pigmentation is more obvious, may be accompanied by telangiectasia, mossy papules, enlarged hair follicles, keratinization and hyperpigmentation around the hair follicle, and even obvious hyperkeratosis or epithelioid hyperplasia For precancerous lesions, the patient tends to sweat more, and the skin lesions have a flashy appearance. The skin lesions can be exacerbated after sun exposure, and the course is chronic and progressive, often accompanied by dizziness, fatigue, loss of appetite, weight loss and other systemic symptoms.

Examination of tar blackness

Histopathology: hair follicle keratosis, subepidermal cell edema degeneration, dermal melanocytes are filled with melanin particles, telangiectasia and more lymphocytic infiltration.

Diagnosis and identification of tar black melanosis

There is a history of long-term exposure to tar and sunlight, and there is an initial inflammatory process. After the skin lesions are examined, there are follicular blackheads, papules, scales, etc., which may be helpful for diagnosis.

Generally not confused with other diseases.

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