The simple answer is no. Colds are caused by viruses, thus walking outside with damp hair will not cause you to acquire one. And having damp hair will not make you more appealing to pathogens. However, it can help spread them around your home. When you brush your teeth or wash your face, wear gloves to avoid spreading bacteria from your hands. If you do get sick right after you use the bathroom, you may be wondering if you can still infect others. The short answer is yes, you can still spread viruses even when you have symptoms yourself. Viruses are very stable, so they don't disappear just because you feel sick. In fact, there's some evidence that people in close contact with someone who has a cold benefit from being exposed to the virus as well. However, if you do decide to go ahead and share your symptoms with others, try not to cough or sneeze too hard. This may cause you to leak secretions that could end up on something else you don't want contaminated. Cleaning products available at stores such as Wal-Mart and Home Depot are effective against viruses, so using ones of these products before you go back out into public should help prevent spreading illnesses.