<prompt> Endothrix is caused byPityrosporumT tonsuransC minutissimumS aureus  <response>: Endothrix-spores inside hair shaft- hairs break at the follicular orifices appear as black dots on scalp Black dot or non inflammatory type of tinea capitis : endothix infection.hairs break at the level of scalp. Causative organism trichophyton.tonsurans. iadvl textbook of dermatologypage 255 