Keratoakanthoma classic type D23.L

Initially fast-growing (usually a few weeks according to the typical medical history), solitary, painless, epithelial tumour, which develops from the hair follicle or the surface epithelium of the skin, initially grows exophytically and infiltratively, changes to a stationary phase after weeks to months and may subsequently have a spontaneous regression tendency. This regression phase is generally not awaited in everyday clinical practice, so that no generally valid statement can be made about this phase.

The classical keratoakanthoma impresses as a solitary, 0.5 cm to a maximum of 3.0 cm (literature: in individual cases up to 9.0 cm!) large, spherically bulging, hard, red or red-brown, centrally dented, painless nodule (or knot), the surface of which is pervaded by telangiectasia (Fig. Keratoakanthoma (overview)).

Typical is a wall-like raised rim which encloses a central, grey-yellow or brownish, sometimes black keratotic plug in a lip shape.

The keratoakanthoma is well movable on its base.

Typically, a three-phase clinical course is observed:

• stage of proliferation (duration about 2-6 weeks) with rapid growth (period of clinical presentation)
• stage of maturation (static phase; duration indefinite)
• stage of regression (this stage is controversial and should not be waited for).

For further information see below Keratoakanthom (overview)

S.u. Keratoakanthoma (overview)