Genetic and environmental factors can influence the predilection for<unk> . Human leukocyte antigens, especially those in the HLA-C group are associated with the skin disorder. Beta-hemolytic streptococci infection is the major contributing environmental factor. The typical route of infection is the upper respiratory system. Rarely it is also caused by a skin infection surrounding the anus (perianal streptococcal dermatitis).
Guttate psoriasis
Inverse psoriasis
Pustular psoriasis
Parapsoriasis
Large plaque parapsoriasis
Quadrichrome vitiligo
Xerotic eczema
Retiform parapsoriasis