Most abnormal hair growth on the forehead occurs on the forehead, and most hair growth that occurs on the forehead is caused by medications. Some drugs have the effect of stimulating hair growth, the most common is minoxidil tincture, this drug can improve the local blood flow to the skin, increase the nutrition of hair, have a very good hair growth prevention effect. Some patients use improper operation, often spray the drug to the forehead, easy to cause forehead hair growth. Glucocorticoid drugs also have a certain role in promoting hair growth, long-term use can make the local sweat hair darker and thicker and longer. It can be removed by laser or other means after stopping the use of hormones. In addition, the forehead area can also appear normal cui hair, belong to the human body’s normal skin structure, without special treatment. If there is abnormal blackening and thickening of the hair on the forehead, it is recommended to go to the hospital in time to clarify the cause of the disease.