What could the cause of this be?

So I've been traveling between two different countries recently and I noticed that a few days after I arrive to one place I develop little bubbles underneath the skin of my left thumb, this then becomes mildly itchy and then the skin becomes slightly yellow and hard. The skin then eventually peels off, but it takes a while to do so. Sometimes the dry skin gets under my nail as well. Do any of you know what could be the cause of this and how I can get rid of it as it gets extremely annoying.