A disease in which well-defined, erythematous-sclerotic focuses with clear perifollicular hyperkeratosis on surface are located on exposed places and scalp. The changes are often combined with the feeling of smartness, skin tensity and itching. If not cured, it passes leaving scars and permanent alopecia.

In trichoscopy there is presence of red or blue-grey dots typical for this disease.

Curing: immunosuppressive medicaments used topically or in more advanced cases – orally.