Exceptionally high dandruff in 11 year old boys can be improved by physical sun protection and antifungal medication. Common factors that cause dandruff in 11 year old boys are sunburn, fungal infections and so on. 1. sunburn: under strong ultraviolet radiation, may lead to scalp damage, thus appearing 11-year-old boy dandruff especially high situation. It can be improved by physical sun protection, such as wearing a hat, playing umbrellas and so on. 2. Fungal infection: when the scalp is infected by fungus, the fungus and its metabolites may cause damage to the local scalp, resulting in 11-year-old boy dandruff especially. You can relieve the symptoms by using ketoconazole lotion and so on under the guidance of the doctor. When the 11-year-old boy dandruff is particularly high, should promptly seek medical attention, under the guidance of the doctor to improve the physical examination, fungal culture, patch test, etc., to clarify the cause of the disease, and active treatment.