Answer by  
                                                                                          whoareyou (3483)
                                                            
                          
                          
                                                          A few things can cause this, or little bumps that look like pimples, such as; Shaving, deodorant, lotion or other skin product reactions, stress, or excessive sweating/dirt. Try shaving less or waxing if possible, and use a sensitive skin deodorant that prevents perspiration. Remember to scrub your under-arms every day to clear the pores from deodorants, lotions, and sweat.