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The most common skin diseases, including allergic and infectious skin conditions, may induce or aggravate psoriasis.

Allergic skin diseases

Drug-induced dermatitis and contact dermatitis are the most common skin diseases. Drug-induced dermatitis is often caused by sulfa, tetracycline, or penicillin. Slipper dermatitis, hair dye dermatitis, paint dermatitis, metal chain dermatitis, tape dermatitis, pesticide dermatitis, diaper dermatitis, etc., are often the causes of contact dermatitis.

Infectious skin diseases

person showing left eye

Other skin diseases

Other skin diseases such as insect bite dermatitis, fever and eruptive infections, pityriasis rosea, lichen planus, prickly heat, dermatophytosis, herpetiform dermatitis and scabies may induce psoriasis. But they are less commonly seen as the two types of diseases mentioned above.


Infectious skin diseases could include furuncle, carbuncle, folliculitis, chickenpox and shingles. Among them, folliculitis, which is prone to occur in summer and autumn, is the most common one.  When patients repeatedly use coal tar (often seen in some shampoos and conditioners) or corticosteroids at this time, folliculitis is more likely to occur. If psoriasis is at the acute stage, it is often seen that the pimples will not disappear even though the pustules on the top of the folliculitis has dried up. Its size will gradually increase and then become psoriasis. This process may result from the “homomorphic reaction” of psoriasis. In some patients after the operation, some part of the wound is infected and purulent, and the other part can still heal usually. As a result, psoriasis will occur in the infected area, not on the healed skin. It may indicate that the inflammation caused by the infection has induced psoriasis

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