Many times, there is also the question in the minds of the girls whether the skin gets contaminated due to makeup during travel or not. Girls never go out without makeup and in such a situation, you will not even know about the effect on the skin.
If you're traveling by public transport, you have to touch many places where many others have joined hands. So if you touch your face with those hands, your face may get contaminated. Bacteria in your hand can go to the face, which can cause a lot of skin problems. So you should wash your hands with anti-bacterial soap before applying makeup.
If you have a clean brush or sponge, it won't contaminate your makeup. But at the same time, make sure that your hand or finger does not accidentally hit your eyes or skin because of the speed breaker. So if you're doing makeup while traveling, take your moves very carefully. However sooner than you are, make sure to apply SPF before leaving the house to avoid UV rays, as well as a lip balm on your lips.
Keep your makeup brush clean. This will not cause bacteria, oil, and dirt to them. If your brushes or sponges are dirty, they may not makeup and you may have pimples.