Scutulum

A scutulum is a yellow, perifollicular, saucerlike or cup-shaped crust with a cheesy odor, composed of dense mats of mycelia and epithelial debris. Scutula often occur on the scalp and are characteristic of favus.

Morphology

 * Consists of a crust-like yellow lesion (sulphur cap)
 * Has a concave-convex surface with its convexity to the scalp making for itself an erosion or depression of epidermis, so it is firmly adherent to the scalp
 * Upon detachment it gives a serosangiunous discharge (serum and blood)
 * size : from a few millimetres to a few centimetres