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What are the aims of this leaflet?

This leaflet has been written to help you understand the term pilomatricoma.  It will tell you what a pilomatricoma is, what can be done about it, and where you can get more information about it.

What is a pilomatricoma?

A pilomatricoma is a benign (non-cancerous) growth arising from the cells at the base of hair follicles. It has also been called a pilomatrixoma, trichomatricoma or a ‘calcifying epithelioma of Malherbe’.

What causes a pilomatricoma?

Why pilomatricoma develops is unknown.

Are pilomatricomas hereditary?

Most pilomatricomas do not run in families, but very rarely (less than 1 in 100,000) there may be a link to rare (less than 1 in 10,000) genetic disorders.

What are the symptoms of pilomatricoma?

A pilomatricoma normally causes no symptoms unless it gets inflamed or infected when it becomes red and sore. Occasionally the growth can burst and release white and yellow chalky fluid. Pilomatricomas can sometimes be uncomfortable.

What does a pilomatricoma look like?

A pilomatricoma normally appears as a single pink or purplish lump containing white areas. The white areas are due to calcium (chalky) deposits and make the lump feel hard as a bone.

They are usually less than 3 cm in diameter, although rarely can be larger. They are most common on the head or upper body in children and teenagers but can develop anywhere on the body at any age.

How is a pilomatricoma diagnosed?

Your doctor may suspect the diagnosis on examining the skin and may refer you for an ultrasound scan. The diagnosis is confirmed by specialist examination of a tissue sample (a biopsy).

Can a pilomatricoma be cured?

Yes, if a pilomatricoma is completely removed surgically, it is considered to be cured. It is very unlikely that they will regrow after being excised (cut out). They do not tend to go away by themselves and will either stay the same size or slowly grow over the years.

How can a pilomatricoma be treated?

The normal treatment for a pilomatricoma is to completely remove the lump surgically with a procedure known as ‘excision’.

Self care (What can I do?)

There is nothing you can do to prevent it occurring but, to prevent it becoming inflamed or infected, you should not pick or squeeze the lesion.

Where can I get more information about pilomatricomas?

Web links to detailed leaflets:

Links to patient support groups:

There are no specific patient support groups for this condition.

For details of source materials used please contact the Clinical Standards Unit (

This leaflet aims to provide accurate information about the subject and is a consensus of the views held by representatives of the British Association of Dermatologists: its contents, however, may occasionally differ from the advice given to you by your doctor.

This leaflet has been assessed for readability by the British Association of Dermatologists’ Patient Information Lay Review Panel





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