<s>[INST] my son visited pediatrician today has a puss filled bump on inside of wrist which also has a red line going half way up forearm. she said for him to go home and put hydrocortisone but if it doesnt get better in couple hours to begin antibiotics. it didnt get better so i began antibiotics but now the red line is even higher past inner elbow. i paged the doctor awaiting her call, is this bad?? [/INST] Thanks for writing to us and sharing your sons' health problem. As per your description, it is nothing but an infective disease and therefore potentially curable and not to worry too much but seek surgical opinion. There are several possibilities in this case like an abscess, in infected bursa, ganglion or a sebaceous cyst; in worse case it could be related to underlying osteomyelitis also.in any case it is necessary to detect the cause and the infective organism by culture sensitivity test. All the best on this! </s>