I have a 9 month old son and he has a strange bruise or rash on the back of his arm. It is really discolored but not like a typicall bruise or rash that i have seen. it also dosent seem to be causing him any pain or discomfort like itching. just curious if anyone has any suggestions or if this warrants a trip to the doc wich is how im leaning right now. thanks for the input.