What causes blisters on the second day after laser freckle removal, and what should be done?

Laser pigmentation removal typically works by using laser energy to destroy pigment cells, breaking down and vaporizing pigment particles to achieve the desired effect. The general reference price for laser pigmentation removal is 1,000–3,000 yuan per session. Noticeable improvement usually appears within 1–2 weeks, although side effects such as pain and redness may occur. Blisters appearing the day after laser treatment may be caused by improper skin cleansing, incorrect aftercare, dietary mistakes, allergic reactions, or bacterial infection. These can be managed under a doctor's guidance through general care measures or medication. Specific causes are analyzed as follows:

1. Improper Skin Cleansing

After laser pigmentation removal, the skin is in a sensitive state. Failure to keep the treated area clean and dry may lead to wound infection and blister formation. It is recommended to maintain cleanliness and dryness of the treated area and avoid contact with water.

2. Incorrect Aftercare Practices

Using skincare products or cosmetics containing irritating ingredients, or excessively rubbing or squeezing the treated area, may irritate the skin and lead to blistering. After laser treatment, it is important to use gentle, non-irritating skincare products and avoid excessive friction or pressure on the treated area to prevent additional stress on the skin.

3. Improper Diet

Consuming excessive spicy, greasy, or otherwise irritating foods after laser treatment may stimulate the wound and contribute to blister formation. During the recovery period, maintain a light diet, moderately supplement vitamins, and avoid eating irritating foods.

4. Allergic Reaction

The body’s immune response to laser energy may trigger an allergic reaction, resulting in the aforementioned symptoms. This is often accompanied by itching and redness. Under medical guidance, medications such as cetirizine hydrochloride tablets, loratadine tablets, or diphenhydramine hydrochloride tablets may be used for treatment.

5. Bacterial Infection

If the wound is not kept clean after laser treatment, bacteria may invade and cause infection. Bacterial irritation of the wound may result in blister formation, possibly accompanied by swelling and pain. Treatment may include topical antibiotics such as mupirocin ointment, erythromycin ointment, or fusidic acid cream, as directed by a physician.

During treatment and recovery, it is recommended to maintain healthy lifestyle habits, practice sun protection, and avoid touching or irritating the wound to promote healing.