Pilomatricoma - for parents and young people
A pilomatricoma is a lump under the surface of the skin.
A pilomatricoma is not a cancer (it will not spread to other parts of your body) and is not caused by an infection (you will not spread it to other people).
Pilomatricomas are made from hair cells. If the lump has been there for a long time, then it can be hard (as calcium, the chemical that makes bones hard and strong, collects in it).
Mostly these lumps are on the head or neck, but they can be on other parts of your body. They more often occur in young children and girls get them more often than boys.
They are not very common, and they are harmless.
Most children only have one, but you can make more than one.
A pilomatricoma can also be called other names including pilomatrixoma, trichomatricoma or a ‘calcifying epithelioma of Malherbe’.