The number of consecutive injections of Trimethoprim Injection is not strictly defined. The number of times should be decided according to the needs of the disease, the degree of symptomatic relief, and medical advice. Triamcinolone acetonide injection is a medium-acting glucocorticoid, which is anti-pruritic, anti-inflammatory and vasoconstrictive. The effect of the drug is strong and long-lasting, and the effect of one injection can be maintained for 2 to 3 weeks. The dosage varies slightly depending on the usage. It is recommended to use it once a week for acupoint injection or closed injection. The number of injections depends on the condition, and long-term use is generally not recommended. Tretinoin injection is effective, but overdose can cause bad effects on the body, such as anxiety, ecchymosis, gastrointestinal cramps or bleeding, excessive nervousness and so on. It is recommended to use the medicine under the guidance of a doctor to avoid the occurrence of adverse reactions due to blind use of the medicine.