1, salicylic acid has certain irritation to the skin, which will make the cuticle thinner, while the cuticle of sensitive muscle and dry muscle is too thin, so it is best not to use it. Especially for sensitive skin, the use of salicylic acid will make its cuticle thinner, and the situation of red blood and tingling will be more serious, so it is not suitable for use. The use of salicylic acid for dry skin may cause rough, dry, dull and yellow skin.
2. The upper limit of the most suitable concentration of salicylic acid is 2%, which is good for daily use. Using high concentration of salicylic acid, the skin will easily become thinner, and the skin's water-locking ability will begin to decline.
3, salicylic acid, its structure is very similar to aspirin, it has anti-inflammatory effect on the skin, but you must pay attention to sunscreen care after use, otherwise it is prone to skin problems such as pigmentation.
Extended data:
Salicylic acid is a fat-soluble organic acid. Salicylic acid (an ingredient in aspirin and many painkillers) is used in clinical trials to reduce the risk of long-term heart disease in diabetic patients.
Because high concentration of salicylic acid is harmful to a certain extent, since 1999, the pharmaceutical department of the Ministry of Health has limited the concentration of salicylic acid in cosmetics to 0.2- 1.5%. Cosmetics containing salicylic acid must be warned to ensure the safety of long-term use, and children under 3 years old are not allowed to use them.
Local effects: too much cuticle removal will worsen the skin's defense, resulting in erythema, itching, tingling or allergies. Therefore, it is necessary to strengthen moisturizing repair when using salicylic acid, and it is best to avoid contact with eyes, face, reproductive organs and mucous membranes. There are also a few people who are allergic to salicylic acid, so any concentration of salicylic acid is not suitable for use.
Systemic symptoms: For general skin care and a small number of users, there should be no systemic side effects. However, for patients who use salicylic acid on a large scale (more than 30% of the whole body area) or for a long time, special attention should be paid to the toxic effect of salicylic acid. Include tinnitus, dizziness, fatigue, nausea and electrolyte imbalance. These symptoms are more likely to occur in children and patients with renal and liver dysfunction. If salicylic acid is toxic, stop taking the medicine immediately.
References:
Baidu encyclopedia-salicylic acid