PDT treatment generally refers to photodynamic therapy. The precautions to be taken after the treatment include strengthening skin care and regular medical checkups. Generally, photodynamic therapy can make the lesion tissue necrosis, so as to achieve the purpose of treating diseases, commonly used in the treatment of solar keratosis, basal cell carcinoma, viral warts and other diseases. As some patients will have burning sensation, erythema, pain and other symptoms after photodynamic therapy, so patients need to strengthen the skin after treatment, should pay attention to keep the treatment area clean and dry, to avoid friction and stimulation of foreign objects. Some patients need to pay attention to avoid strong light irradiation after photodynamic therapy, and those with broken skin can follow the doctor’s instructions to apply anti-infective ointment, such as clindamycin gel, erythromycin ointment, etc., to actively prevent infection. At the same time, patients should also pay attention to regular medical review, in order to monitor the therapeutic effect of photodynamic therapy. It is recommended that patients consult regular hospitals for photodynamic therapy, and eat fresh fruits and vegetables to supplement the body’s vitamin requirements, which will help the skin to restore health.