Do you have a black mole on your body? Just try and keep track of it because Liang Xiuzhen from Sichuan, China, had something rare happen with a small mole on her head. It grew into a big horn-like shape and measured 5″ (12.7 cm) in length and a little over 2″ (5.1 cm) in diameter.

Although doctors weren’t able to find a permanent cure for it, science does have an explanation as to what it is. These are Cutaneous horns, which are types of keratinous skin tumors. Their cause is uncertain, and the treatment is done through chemotherapy, surgery, or radiation therapy.