These bumps can be due to boils or sebaceous cysts. A boil generally starts as a reddened, tender area. Over time, the area becomes firm and hard. Eventually, the center of the abscess softens and becomes filled with pus. Finally, the pus "forms a head," which can be surgically opened or spontaneously drain out through the surface of the skin.
Apply warm compresses on the bumps and keep the area clean. Drainage is done only when it becomes soft and forms a head. Take some over the counter pain reliever and consult a doctor for examination and antibiotics prescription. Also get the possibility of cysts ruled out. If there are recurrent boils, then please get her blood sugar levels estimated.
I hope it helps. Take care and regards.