Dandruff in summer is most likely caused by fungal infection due to more oil in the scalp area, and it may also be caused by the use of irritating shampoos for dry hair. In summer, the weather is hotter, the scalp area is easy to secrete more oil, resulting in local skin fungal infection, and the scalp area is warm and humid, this environment is also conducive to the proliferation of fungi, dandruff becomes more. Therefore, patients should keep the scalp clean, and make sure the hair is dry after washing before going to bed. People with dry hair have more dandruff than people with normal hair, which may be caused by the irritating shampoo chosen by the patient or physical or chemical stimulation of the scalp, so the shampoo used needs to be changed in time. If the summer dandruff situation has not been improved or become serious, the patient should go to the hospital in a timely manner to consult a doctor to clarify the cause of treatment.