You risk nicks and cuts any time you shave an area of your body, but the armpits can be especially tricky because of the shape of the area. It may be difficult for you to see your entire underarm while you shave, so you have to know how to go about the process in the right way to avoid cuts and make sure all the hair is removed.
Wait until the end of your shower to shave your armpits. It's easier to get a close shave after the hair has been softened by water.
Wash your armpits with soap and water to remove any deodorant residue.
Apply a shaving gel or lotion to your armpit according to the product directions. These products help protect your skin and allow you to get a closer shave.
Raise your arm above your head to straighten the skin under your arm. You may find that touching your hand to the back of your neck gives you the most access to your underarm.
Wet your razor under the running water, and slowly run it over the skin you want to shave. If you have creases or folds in your skin, pull them taut as you shave to avoid being left with nicks or spots of missed hair.
Shave in all directions -- up, down and from side to side. Underarm hair grows in different directions, and this method will help you eliminate all of it. Rinse your razor after every few strokes.
Repeat the process on your other underarm.
Rinse your underarms well, and then dry them when you get out of the shower.