For splinters, clean the affected area with soap and water, dip the tweezers in alcohol to sterilize, use needle points of the tweezer to grab the splinter and back it out gently. After particle is removed, disinfect the area with hydrogen peroxide.
To remove ingrown hairs, wash area with soap and water, dip the tweezer in alcohol to disinfect, and use tip of tweezer to isolate the ingrown hair. Tweeze hair out gently in the direction of hair growth.