All the following are primary cutaneous diseases except:
B i.e. Reiter's disease: Reiter's disease or syndrome is primarly a reactive polyahritisQ characterized by presence of non suppurative, painful, asymmetrical oligoahritis with or without urethritis, ureitis, conjunctivitis, oral ulcers and secondary cutaneous involvement in form of rashQ. Psoriasis, Bowen's disease (squamous cell carcinoma in situ), lichen planus and icthyosis are primary cutaneous diseases.
Psoriasis
Reiter's disease
Lichen planus
Icthiosis/Bowen's disease