**3. Diagnosis of radiation-induced skin lesions**

Radiation-induced skin lesion is a skin reaction and is also a side effect of radiotherapy in cancer treatment or interventional radiography. There are two types of radiation-induced skin lesion, depending on the time of skin reaction: An acute skin reaction develops hours to weeks after the first exposure to the radiation; The next progression is chronic radiation-induced dermatitis, which may develop months, years or even decades after radiotherapy.

#### **3.1 Manifestations of acute radiation-induced skin lesions**

Local changes may occur immediately after irradiation, during the entire course of radiotherapy up to 90 days after radiation. The specific clinical symptoms are as follows [16]:


folds. Due to the loss or reduction of the protective function of the epidermis, this expression can form acute ulcers.

• Folliculitis: This is a symptom of the hair follicle infection, manifested by small erythema.
