Hair can pick out small yellow particles may be seborrheic dermatitis, folliculitis and other diseases caused. 1. Seborrheic dermatitis: the cause of the disease is mainly related to genetics, microbial infections and other factors, and it occurs in the scalp, face and other places. Patients will mainly appear dandruff, itching and other symptoms, some patients will appear in the hair can pick out the phenomenon of small yellow particles. 2. Folliculitis: mainly bacteria, fungi and other pathogens caused by hair follicle infection, some may also be related to the body’s immune function, allergic reactions, mite parasites and other factors. If folliculitis occurs in the scalp, there may be hair can pick out small yellow particles of the situation. There are many causes of yellow grains in the hair, so it is recommended that patients go to the hospital to clarify the cause of the disease.