Phyllodes tumor is a rare, aggressive tumor of the breast. It usually occurs in women older than 40 years old. This tumor presents with a rapidly growing mass in the breast. It may increase in size so much that it would tear and ulcerate the skin overlying the tumor. Reference: Bailey and Love's Short Practice of Surgery Image via: https://www.researchgate.net/publication/347401679_Malignant_phyllodes_tumor_of_the_breast_with_rapid_progression_a_case_report/figures?lo=1&utm_source=google&utm_medium=organic