Do other skin diseases promote fungal contamination?
Not always. The risk of contamination increases only when the first disease leads to formation of cracks and erosions in the skin, i.e. entry of infection, or delays the process of desquamation of horny scales.
Some cases have been known when patients with severe hand dermatosis revealed some signs of fungus, however, the fungal infection failed to develop in them. It happened, because these people washed their hands frequently and the scales of epidermis on which dwelt the fungi were just washed away with water.
In psoriatic patients the scales of the horny layer come off more intensely than usual, and the pathogenic fungi are removed with them.