Subcutaneous sarcoma develops insidiously and generally does not indicate a specific period of development. The incubation period is generally defined as the period of time between the invasion of the organism by the pathogen and the appearance of clinical symptoms. It mostly refers to infectious diseases. Subcutaneous sarcoma is not caused by infection, so it does not have an incubation period and can only be discussed as an “insidious period”. Subcutaneous sarcoma can occur anywhere, but it is more common in the lower legs, ankles, forearms and trunk. There is no valid data to support an occult stage. Most of the patients are not obvious in the early stage, and it is difficult to be detected, and it is only when it is large in size with pain, swelling, pressure and other abnormal sensations that it is detected. When a subcutaneous sarcoma is suspected to be present in the skin, the patient may undergo pathologic examination to make a clear diagnosis. Subcutaneous sarcoma is mostly a solid mass, its tissue section is grayish white, and its general prognosis is poor.