If a pregnant woman did not have bumps in her armpits before, it is not normal to have bumps, but there are many clinical situations in which bumps in the armpits can occur, so pregnant women must go to the dermatology department of a regular hospital and let the doctor determine what causes them. 1, the more common reason is that the patient has skin allergies, such as skin allergies can be locally manifested as papules, papules or pimples. 4, some patients in the armpit appear dense bumps, in fact, due to the occurrence of prickly heat, which is closely related to the pregnancy after the local body temperature is significantly higher, and more sweating.