Abstract
The trichofolliculoma is a follicularly differentiated hamartoma, usually described as showing many vellus follicles, spreading from a central infundibular cyst. In spite of the well known regressive changes of normal hair follicles during catagen and telogen, the possibility of corresponding changes in the trichofolliculoma has not yet been discussed in the literature. By examining a total of 31 cases of trichofolliculoma it is demonstrated that this hamartoma undergoes an evolutionary process with great morphological changes, which can be attributed to the anagen, catagen, and telogen phase of the follicular cycle.
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