A male mastocytosis nodule is also known as a breast lump that is less than 1 centimeter in size. Mastomas is a broader concept in medicine, generally refers to a lump in the breast area, and its size needs to be kept below 1 cm, so male mastomas nodule means that male patients have a small size lump in the breast area. Breast nodules are small and hidden, so most of them can not be detected by palpation or visual observation, and need to be exposed to professional breast ultrasound, B ultrasound or molybdenum target examination to be able to find out. If the breast enlargement nodule appears to be persistently enlarged, or other abnormalities, it is necessary to improve the examination in time to avoid delaying the condition.