Brushing your hair to stimulate your scalp will not cause dandruff to grow. Dandruff is usually caused by seborrheic dermatitis and fungal infections. In the absence of scalp diseases, combing the hair will not cause dandruff to grow more and more, just combing the process of combing the dandruff attached to the scalp combed down, not combing caused. If the patient has certain diseases of the scalp, such as seborrheic dermatitis, it will lead to an increase in dandruff, but also the symptoms of scalp itching. If the patient has a fungal infection that causes ringworm, it can also lead to increased dandruff. If dandruff is increasing, it is important to seek medical attention and diagnosis and treatment under the guidance of a doctor.