The appearance of white patches on the scalp may be seborrheic dermatitis, or what is called plaque seborrheic dermatitis. This type of seborrheic dermatitis tends to be scattered, and it manifests itself as scaling on top of a small erythematous patch on the scalp, which is usually white in color, and may also be accompanied by some mild exudation. Therefore, if you encounter this situation, you need to actively treat, need to follow the seborrheic dermatitis routine for standardized treatment, can be appropriate oral second-generation antihistamines, local can use Haxinaid solution for external application.