Hi,my 16 year old has these bloches on his chest and back that seem to get worse in the summer..my younger son had it and I used baking soda water and scubbed it and it came off and has never came back...but my older son's just keeps coming back..we live in the county the state Tenn.I am telling you this cause I've benn told it might be a fungus from a tree or allergy.It does'nt itch or hurt.But just want to know what it is and how to get rid of it!!!Please