One corn is a local keratinization of the skin. It is caused by permanently high pressure or friction, as it causes, for example, too tight footwear. A deep into the skin reaching into the corneal cone can cause severe pain. Read all about the causes, treatment and prognosis of corns.

ICD codes for this disease: ICD codes are internationally valid medical diagnosis codes. They are found e.g. in medical reports or on incapacity certificates. L84ArtikelübersichtHühnerauge

  • description
  • symptoms
  • Causes and risk factors
  • Examinations and diagnosis
  • treatment
  • Disease course and prognosis

Corn eye: description

A corn (Clavus, crow's eye, Leichdorn) is a roundish, sharply demarcated thickening of the skin. In the center of corns sits a hard, pointed corneal cone, which extends into deeper layers of the skin and causes pain in pressure.

The corn is very common. Particularly affected are women, rheumatism and diabetes patients.

Where and how do corns emerge?

Corns are caused by permanent pressure or friction on the skin. The cause may be, for example, too tight footwear or a Fußfehlstellung.

Due to the constant pressure, a callus first forms on the foot. The uppermost layers of skin thicken and mutilate, forming a protective cushion against permanent external stress. Over time, this increased keratinization (hyperkeratosis) extends into deeper layers of the skin, creating a central, horny spine.

A corn-eye on the foot - on the sole of the foot or the sides - is the most common form of Clavus. Cause are often pressure loads by a spreading or Senkfuß. Also, a corn on the toe is not uncommon, mostly caused by tight shoes. A clavus can even form on the joints or under the toenails. In very rare cases, a corn-eye develops on the finger.

Different types of corn-eye

Physicians distinguish different forms of corns, but in practice can not always be exactly separated from each other. Different types of corns may require different therapies.

  • Clavus mollis (soft corn-eye): Found between very tight or deformed toes and has a soft, flat core.
  • Clavus durus: A corn-eye with a hard, strongly compressed corneal core. Mostly located on the outer foot.
  • Clavus subungualis: A corn-eye under the nail.
  • Clavus vascular: A corn-eye containing blood vessels. That's why it often bleeds when removed.
  • Clavus neurovascular: Nervous coral and therefore very painful.
  • Clavus neurofibrosum: A very large corn eye. The sole of the foot and bales are particularly affected.
  • Clavus papillaris: Is indicated by a white border. In the middle under the layer of the cornea there is an accumulation of fluid, for example a bruise. Therefore, this corn is very painful.
  • Clavus miliaris: Represents a peculiarity among the corns. It is a non-deep, round cornification, which occurs especially in places that are not subjected to pressure. Since there is no pain in a Clavus miliaris, it is also referred to as pseudo-chicken eye.

Corn or Wart?

Corns and warts can look alike. The experienced chiropodist or doctor recognizes the difference immediately.

Warts as well as the corn-eye develop in places exposed to heavy mechanical stress. The most common type is the plantar wart, which is usually under the cornea and contains small black spots or dots. These are dried bleeding. Unlike a corn, warts have no corneal wedge in the middle and affect only a few skin layers, so they are rather flat.

The cause of a wart is a bacterium or virus that invades cracked or injured skin. The most common trigger is human papillomavirus (HPV).

To the table of contents

Corns: symptoms

A corn-eye appears as a round, sharply demarcated corneal thickening, which - caused by the thick layer of the cornea - appears yellowish. It is about five to eight millimeters in size.

In the center of the clavus sits a thickened horn (keratin cone), which extends funnel-shaped into deeper skin layers and causes pain when pressed. A small corn-eye is initially only uncomfortable when walking; larger corns, on the other hand, can cause severe pain and limit the mobility of the affected person in such a way that it can lead to occupational disability.

The tissue can change around the thorn. Sometimes fluid accumulates (edema) or inflammation develops.

If the corneal cone presses on a joint, it can grow together with the surrounding area of ​​the joint capsule and trigger peritoneal irritation or inflammation.

If the corn-eye cracks or is scratched, germs can get inside. These trigger suppurative processes (abscesses) or inflammation. The germs can also spread in the skin (erysipelas) or cause blood poisoning (sepsis).

To the table of contents

Corns: causes and risk factors

A corn-eye arises when skin that is stretched over a bone is permanently exposed to high pressure or friction. The most common cause is wearing too tight shoes, Especially tight, oppressive shoes like high heels or tight hard leather shoes like pointed boots are dangerous. For this reason, women also have corns more frequently than men.

Also socksthat rub on the skin can cause a corn.

In addition to inappropriate footwear favor deformities the feet and toes the emergence of corns. Deformations such as hallux valgus, hammertoes or bony outgrowths (exostoses) increase the burden on individual areas - a corneal eye forms on the foot.

Dry skin, one genetic predisposition for corneal formation and certain Metabolic disorders are also risk factors for the development of corns. Also one radiotherapy In cancer patients, according to the latest findings, the formation of corns may favor.

Especially at diabetes patients If a corn is a potential entry port for germs, it has to be treated with special care.

To the table of contents

Corn eye: investigations and diagnosis

A doctor or experienced medical chiropodist (podiatrist) usually recognizes a corn-eye right from the start. The keratin cone can be detected with a magnifying glass.

A corn-eye against a wart must be delineated: Excessive keratinization (hyperkeratosis) can also occur with them. The very common plantar warts, however, can be distinguished from a corn-eye by the brown dots and bluish-black, strip-like deposits in their center.