Color ultrasound is a commonly used imaging test, and a child with a hard lump under the scalp can have a color ultrasound. Color ultrasound is color Doppler blood flow imaging. Color ultrasound is the use of ultrasound diagnostic equipment issued by the ultrasound into the body, through the body of the tissue and organs formed by the reflection wave returned to the ultrasound diagnostic equipment, the formation of the corresponding image, ultrasound is not radiation, compared with X-ray, CT is more secure. Therefore, color ultrasound is a safer choice for checking children’s subcutaneous hard lumps. Color ultrasound has the advantages of two-dimensional ultrasound structural images, and at the same time provides hemodynamic information, is one of the commonly used auxiliary means of examination in the process of diagnosis and treatment by doctors, can initially determine the nature of the child’s subcutaneous hard lumps, the size of the child’s subcutaneous hard lumps as well as the status of the blood supply, which will help doctors to make a clinical diagnosis and formulate diagnostic and treatment plans. Children with a hard lump under the scalp, it is recommended to follow the doctor’s instructions to improve the relevant examination, and carry out the appropriate treatment.