The Boston study, in Archives of Dermatology, looked at more than 82,000 female nurses aged 27 to 44 and their drinking habits from 1991 until 2005.
Non-alcoholic beer, wine and spirits were not found to increase the risk.
In the study, researchers said that woman who drank more than two alcoholic drinks a week increased their risk of psoriasis by two-thirds compared with non-drinkers.
For women who drank five glasses of beer per week their risk of developing psoriasis was 1.8 times higher again.
When stricter criteria were used to confirm psoriasis cases, their risk was increased 2.3 times.
Yet women who drank any amount of low- or non-alcoholic beer, white wine, red wine or spirits per week were not found to be at increased risk.