The following alopecia has a strong effect of solid hair and black black.<br><br><br>1. Excessive secretion of oil and fat<br><br><br>2. Oversecretion of local androgen in scalp<br><br><br>3, the lack of trace elements, the decline of the function of the head cell<br><br><br>4, working pressure and environmental pollution incorrectly shampoo and perm<br>双语对照