I am seeing small blisters on my skin very often these days. They are itchy and when I scratch they multiply within the same area. I usually get them on my hands but last June I got them on my neck as well( I travelled in a public bus a day before). They usually disappear in a week and are a rare occurrence. But these past couple of months they have come more often. I do not know the exact reason but they appear when I travel in bus, or to a different place etc although I am not entirely sure.. I researched a bit and found that contact dermititis could be the issue, however I don't know why they occur mostly on my lower hands every time.