It is necessary to determine whether the sarcoma is on the outside of the skin or under the skin. If it is on the outside of the skin, it may be a viral wart or a sebaceous cyst, small viral warts or sebaceous cysts can be followed and do not need to be removed surgically. If a small sarcoma appears under the skin, it may be a lipoma or a sebaceous cyst, both of which are benign lesions. Lipomas are caused by the proliferation of fatty tissue, and small lipomas can be removed without surgery. After the diagnosis is clear, surgery is recommended because the internal tissues may become infected with bacteria and form abscesses after a long time.