Suggest Medication For Itchy Bumps On Body

For the last week I have been having these bumps appear on my body out of nowhere. They show up on my arms, back, neck, face, hands, feet, legs/thighs, breasts, and on my scalp. They resemble mosquito bites but they are bigger. They turn red. No puss or liquid comes out when they break. They just itch. I dont see any mosquitos at all and I havent been outside. I also stay in a house with 6 other people and none of them have any bumps on them. I dont know what they could be or what this can be a sign of. Can someone help please? This is so irritating. (New events in my life) I had a baby 3 weeks ago and I do breast feed. I dont know if that info will help. Hopefully it does.