Shave carefully Shaving is a common and inexpensive way to remove unwanted hair. But shaving can cause skin irritations, especially if your skin is thin, dry or very sensitive. For a smooth shave:
Press a warm wash cloth on your skin before shaving to soften the hair. Or shave after a warm bath or shower.
Don't shave dry skin, which can cause razor burn. Apply shaving cream, lotion or gel before shaving to protect and lubricate your skin.
Use a clean, sharp razor. If using an electric razor,don't use the closest setting, which can irritate the skin.
Shave in the direction of hair growth, not against it.
Rinse your skin afterwards with warm water.
If irritation does occur, apply a lotion that doesn't contain ethyl or isopropyl alcohol. Though alcohol and alcohol-based products may feel cooling, they don't really soothe irritated skin because the alcohol evaporates rapidly from the skin.
Source www.skincareinfo.com