China - In Linlou village, Henan, a grandmother Zhang Ruifang,101 began developing a mysterious protusion on her forehead that looks like a horn last year.
Since then it has grown 2.4in in length and another now appears to emerging on the other side of the mother of seven's forehead.
The condition has left her family baffled and worried.
Her youngest of six sons, Zhang Guozheng, 60, said when a patch of rough skin formed on her forehead last year 'we didn't pay too much attention to it'.
'Now something is also growing on the right side of her forehead. It's quite possible that it's another horn.'
Although, it is unknown what the protrusion is on Mrs Zhang's head, it resembles a cutaneous horn.
This is a funnel-shaped growth and although most are only a few millimetres in length, some can extend a number of inches from the skin.
Cutaneous horns are made up of compacted keratin, which is the same protein we have in our hair and nails, and forms horns, wool and feathers in animals.
The growths are most common in elderly people, aged between 60 and the mid-70s. They can sometimes be cancerous but more than half of cases are benign.
Common underlying causes of cutaneous horns are common warts, skin cancer and actinic keratoses, patches of scaly skin that develop on skin exposed to the sun, such as your face, scalp or forearms.
Cutaneous horns can be removed surgically but this does not treat the underlying cause.