Such patients would either be effectively treated with IV antibiotics in observation for 24 hours and discharged when their condition improved, as cellulitis often does with 24 hours of antibiotic treatment, or would be given one dose of IV antibiotics in the emergency room and sent home with antibiotics by mouth and a follow up appointment soon after the ER visit.
Most grown people will not come out and ask me about my condition, so in order to make sense of me they have to either watch and gather information through observation or use their own preconceived notions.