There is a risk of worsening psoriasis with the treatment of psoriasis vulgaris with Capotriol Ointment. Calcipotriol Ointment is a vitamin D derivative that effectively inhibits the proliferation of skin cells and induces their differentiation, thereby correcting the abnormalities of proliferation and differentiation in psoriatic lesions. The total reported rate of adverse reactions to this medication is approximately 0.01%, and the common adverse reactions, in descending order of frequency, are itching, burning sensation, tingling sensation of the skin, skin irritation, skin dryness, erythema, rash, eczema, contact dermatitis, worsening of psoriasis, hyperpigmentation of the skin, hypopigmentation of the skin, photosensitization, and urticaria, among other symptoms. Since the use of the drug has a certain possibility of aggravating the existing psoriasis, it is necessary to note that this product should be avoided for the face, and during the treatment with this product, it is recommended that the patient should reduce or avoid overexposure to natural or artificial light. Meanwhile, if the above adverse reactions occur, it is recommended to go to the hospital in time.