Hi, my 6 month son had what looked like a pimple on his lower stomach. It had a black dot on the inside. A day later the pimple burst . Right now the area looks very infected. It is circular and dark in color and other parts that looks moist. Its almost as if the circular infection is getting bigger in size. It does not appear to be painful but it looks bad. What could it be. FYI the pimple falls below the belly button so it gets covered by his pamper.