Why do I get pimples? There are many causes of acne, including excessive sebum production, abnormal keratinization of follicular sebaceous ducts, Propionibacterium acnes infection, inflammatory response, immune factors; other triggers: genetics, diet, mental factors, gastrointestinal disorders, climate, chemical exposure, etc. Why does acne recur after it has been cured? The recurrence of acne vulgaris is related to a variety of factors such as the patient’s psychology, emotional changes, diet, sleep, use of cosmetics, occupation, and environment. Improving skin texture and controlling sebaceous gland secretion are fundamental to curing acne and preventing recurrence. What treatments are available for acne? First of all, patients should pay personal attention to skin care; avoid high-fat, high-sugar, spicy and stimulating diet; pay attention to rest and regular life; exercise appropriately and keep a relaxed mood. According to the degree of the disease, medication and physical treatment can be carried out. Medications include oral treatment with retinoic acid, antibiotics, anti-androgen, etc., and topical treatment with retinoic acid, benzoyl peroxide, antibiotics, azelaic acid, etc. Of course no matter oral or topical medications, more or less all have certain defects and side effects. The newly born physical therapies such as fruit acids, ALA-PDT photodynamic, laser, intense pulsed light, red and blue light, and pulsed dye laser have become the best choice for acne patients who are intolerant to medication or unwilling to accept medication. What is the principle of photodynamic treatment for acne? Photodynamic therapy refers to the topical application of a photosensitizer to the affected area and irradiation of the lesion area with specific wavelengths of light to kill Propionibacterium acnes, inhibit sebaceous gland secretion, and promote the self-healing of lesions to achieve the goal of treating acne. How can we stop recurrent acne from occurring? To treat acne and prevent recurrence, we should focus on the root cause of acne, the sebaceous glands. The ALA-PDT photodynamic therapy developed in recent years is the first topical treatment that does not have systemic toxic side effects and takes into account both the symptoms and the root cause of recurrence. It effectively removes unsightly acne while acting directly on the sebaceous glands, causing reversible damage to the sebaceous glands, improving the local skin microenvironment, and inhibiting sebum secretion in the long run, greatly reducing the chance of acne recurrence. What types of acne is photodynamic therapy suitable for? Photodynamic therapy is suitable for mild to moderate acne with inflammatory papules and pustules, and for severe acne of any type, including cysts and nodules, occurring on any part of the body. What should I be aware of after photodynamic acne treatment? There is a slight itching and burning sensation during the treatment process, and some patients experience slight redness and flaking after treatment, which is normal and requires no special treatment. If the skin redness and swelling is obvious, you can use daily cold water wet compresses and seek medical attention promptly. After treatment, you need to avoid light for 24 hours and routinely use a high-density physical sunscreen topically. Transient aggravation of acne, even the appearance of pustules and pustules, may occur during the initial period after treatment and is a normal reaction. Most patients can be relieved within 1-2 weeks. Do not squeeze the pustules and pustules by yourself to avoid local infection. Dry skin, flaking and hyperpigmentation may occur after treatment, all of which are normal treatment reactions. What are the advantages of photodynamic therapy for acne? Photodynamic therapy only works locally and does not accumulate normal skin, so it is safe and painless. At the same time, it avoids the systemic side effects such as dry mouth and lips, liver and kidney function damage caused by long-term medication.