I woke up yesterday and noticed pain under my right armpit. I felt my armpit and found hard bumps or lumps and they are pea-sized and painful to the touch. There is about 10 under the right armpit. The skin is slightly red and I also have them under my left armpit, but only about 5 of them. They are painful to the touch as well and slightly itchy. The pain feels prickly and tender and it hurts more when I move my arm. I also have some red bumps just above my armpit around the area where your arm is connected to your chest, but they don't itch or hurt at all. I thought maybe it was some sort of heat rash but the pain in both my armpits seems to be getting worse. I'm on my second day and they don't seem to be subsiding at all. I've looked up hidradenitis suppurativa, but the symptoms and pictures I have seen of it seem extreme and mine doesn't look that bad. Just really painful. What could this be?