What is the reason for a rash on my face due to the hot weather?

In the hot summer, as the temperature rises, the blood in the human body will flow faster, which will easily lead to some rashes on the skin. It is also common to have rashes on the face when the weather is too hot. This is a manifestation of skin allergies caused by the dry environment. Red papules will easily appear on the facial skin, and itching may occur. It can be treated with topical medications.

What causes rashes on face due to hot weather?

It may be an allergic skin disease. Avoid allergic and irritating foods such as fish, shrimp, strong tea, coffee, alcohol, onions, garlic, etc. Avoid all kinds of external stimuli

Causes of allergies

Main substances

The cause of skin allergies is that certain ingredients in cosmetics stimulate skin cells, causing them to produce antibodies, thus leading to allergies. The most common allergens in cosmetics are fragrances, preservatives and heavy metals. Among them, heavy metals mainly refer to some cosmetics that contain excessive amounts of lead and mercury, which have exfoliating and whitening properties. There are also hair dyes, paraphenylenediamine, cobalt chloride, oil paint nickel sulfate, and rosin. The spices mentioned here are not pure natural high-quality essential oils, but are generally inferior flavors or chemical flavors. However, after artificial fragrance adjustment, the smell is good, but the effect cannot be guaranteed. If people with genetically sensitive skin use cosmetics in a highly sensitive state, they are very likely to develop cosmetic contact dermatitis or aggravate the original disease.

main reason

If there is no quality problem with the cosmetics, but consumers still experience allergies after using them, there are mainly the following reasons:

1. Use cosmetics on the basis of existing skin inflammation.

2. Use several cosmetics interchangeably.

3. Use inferior cosmetics.

4. Failure to use cosmetics correctly.

The use of cosmetics with no quality issues causes cosmetic acne, cosmetic photosensitivity dermatitis and cosmetic skin pigmentation abnormalities, which are mainly related to improper selection of cosmetics by consumers. If people with oily skin choose water-in-oil cosmetics, it may lead to sebum excretion disorders and form blackheads and inflammatory papules, or secondary infection to form pustules.

Internal and external factors

1. Internal causes of allergies

1. The skin structure is damaged.

2. The skin's immune and protective functions decline.

Second, allergic external factors

1. Exposure to wind, cold, heat, spicy food, sunlight, excitement, scratching, pressure, seafood, cosmetics, bites, dust, pollen, cold water, etc.

2. Various counterfeit and inferior cosmetics or cosmetics that are not suitable for you.

3. After peeling with Chinese herbal medicine or chemical drugs.

4. Long-term application of hormone-containing ointments or cosmetics.

5. Oily skin or damaged skin after acne heals.

6. Age: Perhaps aging is an important reason for skin sensitivity. Some people's skin was not sensitive a few years ago, but has become sensitive in recent years. This is because there is a weakly acidic sebum film on the surface of young and healthy skin, which retains moisture and protects the skin from external damage. However, as we age, this sebum film is not as healthy as before, making it easy for some sensitive substances to invade the skin.