What causes itchy rashes?

In daily life, rashes on the skin are a common skin disease, and there are many reasons for rashes on the body. Generally, if the skin is allergic to a certain plant or animal hair, it will easily cause rashes on the skin, and it will also easily cause severe itching, accompanied by redness and swelling of the skin. It needs to be treated in time, and pay more attention to skin hygiene.

What causes itchy rashes?

This itchy rash may be caused by allergies. You need to pay attention to your diet. It is recommended to do an allergen test to find out whether you are allergic to any food or environmental factor. Pay attention to eating a light diet and avoid spicy food.

Causes

The cause of sensitive skin is not fully understood but is the result of multiple factors. It can be divided into endogenous factors such as race, age, gender, genetics, endocrine factors, certain diseases, etc., and exogenous factors such as chemical stimulation, environmental factors, lifestyle, psychological factors, etc.

1. Endogenous factors

(1) Race: Different races have different numbers of stratum corneum, intercellular adhesion, amount and volume of melanin, etc., which leads to differences in skin sensitivity.

(2) Young people are more prone to skin sensitivity than the elderly, probably because the elderly have decreased sensory nerve function and reduced nerve distribution in their skin.

(3) Gender: Generally speaking, women are more sensitive to skin irritation than men, probably because women’s skin has a higher pH value and is less able to buffer irritation.

(4) Most individuals with genetically sensitive skin have a family history of sensitive skin.

(5) Endocrine factors: The menstrual cycle can affect the sensitivity of the skin.

(6) Diseases Certain skin diseases can increase skin sensitivity, such as atopic dermatitis, seborrheic dermatitis, ichthyosis, etc.

2. Exogenous factors

(1) Chemical factors such as cosmetics, soaps, detergents, etc.

(2) Environmental factors such as cold, heat and rapid changes in temperature, seasonal changes, air pollution, sunlight, etc.

(3) Lifestyle: Spicy and stimulating food and alcohol can aggravate skin reactions.

(4) Psychological factors such as increased stress and emotional instability often stimulate or aggravate skin reactions.

Clinical manifestations

Patients with sensitive skin often experience itching, tingling, prickling, burning, and tightness. The severity varies from person to person. After using cosmetics, the discomfort becomes more severe, and some people cannot even tolerate any skin care products. It can appear within minutes, hours, or even days after use. Dry skin, facial erythema, and fine scales may sometimes be seen. The face flushes easily. Clinical types can be divided into:

1. Environmental type

It is common in fair, dry, and thin skin, and mainly reacts to environmental factors, such as sensitivity to cold, heat, and rapid temperature changes. Facial flushing may occur frequently.

2. Cosmetic type

Reactions mainly occur to cosmetics.

3. Very sensitive

Severe reactions may occur to exogenous factors such as cosmetics, environmental factors, and endogenous factors.