summer dermatitis
Introduction
Introduction to summer dermatitis Summer dermatitis (dermatitisaestivale) is a seasonal inflammatory skin disease caused by hot weather, often occurring from June to August. More common in adults. Symptoms of skin lesions occur in the trunk and limbs, especially on the side of the calf. It is characterized by a large bright red spot, and there are needles to miliary size papules and herpes on the basis of erythema. Accompanied by itching, scratches and blood stasis can occur after scratching, and the skin is rough and thick for a long time. basic knowledge The proportion of illness: 1% Susceptible people: no specific population Mode of infection: non-infectious Complications: dermatitis, sun dermatitis
Cause
Summer dermatitis cause
Cause:
Sweat stimulation (45%):
Sweating is the main channel for heat dissipation and excretion in the summer. In high temperature days, human sweat can reach 3 to 4 liters per hour, while sweat accounts for 99% of water. The remaining 1% is represented by sodium and potassium. Half of inorganic salts are organic substances metabolized by urea, lactic acid and amino acids. These inorganic salts and organic substances are not substances normally present on the surface of the skin. When the water evaporates, these will stay on the skin. When the amount is too long, it will cause irritation to the skin and cause inflammation of the skin.
Sun exposure (30%):
Going out frequently in hot weather. Do not use the sunshade when going out, so that the skin is exposed to strong sunlight directly. Excessive ultraviolet rays can also cause skin damage and cause dermatitis.
Pathogenesis
High temperature and sultry environment in summer.
Prevention
Summer dermatitis prevention
(1) It is not advisable to wear underwear that is not breathable. It is best to wear all-natural underwear such as cotton or silk.
(2) You can often wash the affected area with warm and cold water, and avoid using hot water to wash the affected area in order to stop itching.
(3) Drink plenty of water in the summer, not drink more sugary drinks. Drink plenty of water to dilute the concentration of chemical components in the sweat.
(4) Stay in a cool and ventilated place as much as possible under high temperature conditions to avoid frequent outings. It is best to use black umbrella shades when going out on cloudy and sunny days, because black can absorb ultraviolet light of various wavelengths to block the damage of ultraviolet rays to the skin.
(5) The humid and humid season can be used to dehumidify the air conditioner to avoid excessive sweating.
(6) Pay attention to the environment ventilation and heat dissipation, avoid wearing airtight clothing, pay attention to personal hygiene, and keep the skin dry.
Complication
Summer dermatitis complications Complications dermatitis sun dermatitis
Summer dermatitis is due to the continuous high temperature, high humidity environment, and the skin sweating is not cleaned in time. The inorganic salts and organic substances in the sweat are not substances normally present on the skin surface. When the water evaporates, these will stay on the skin. If the amount is too long, it will cause irritation to the skin and cause inflammation of the skin. Common complication of summer dermatitis is irritant dermatitis, erythema, desquamation, and burning sensation and itching. Skin infections cause infection due to skin damage caused by scratching.
Symptom
Symptoms of dermatitis in summer Common symptoms Itching, blood stasis, herpes, papules, sunburn, seasonal light red patches
From the beginning of the skin lesions, the erythema of the needle tip size, papules, followed by the appearance of herpes, rash, visible line-like epidermis scratching and blood stasis and pigmentation, etc., no erosion, exudation, high temperature, high humidity, The skin lesions are aggravated, and the symptoms are relieved with the coolness of the weather. The rash gradually subsides. The skin lesions are mainly distributed on the extremities of the extremities. It is most common in the lower extremities. It occurs in adults over 30 years old, and is more common in women. More prone to occur, consciously itching.
Examine
Summer dermatitis examination
Diagnostic basis: its typical symptoms occur in the extremities of the extremities, especially in front of the two calves, symmetric incidence. From the beginning, it is corn-sized, densely packed erythema, papules or papules, and itching is obvious, accompanied by a burning sensation. Due to the itchiness and scratching, there are often many strips of scratches and blood stasis, which will leave pigmentation after disappearing.
Histopathology: thickening of the epidermis, mild expansion of the superficial capillaries, and infiltration of inflammatory cells mainly composed of lymphocytes around the blood vessels.
Diagnosis
Diagnosis and differentiation of summer dermatitis
According to the onset of hot and humid summer, recurrent erythema can be diagnosed based on small papules. However, it must be differentiated from other skin diseases caused by damp heat such as scorpion and summer pruritus.
Scorpion: It is a superficial, inflammatory skin disease that is common in summer or hot environments. Because of the high temperature and sultry environment, a large amount of sweat is not easy to evaporate, so that the stratum corneum is impregnated and swollen, and the sweat gland duct is narrowed or blocked, resulting in sweat retention, sweat exudation around the tissue, formation of papules, blisters or pustules, which occur in the wrinkles.
