I have a hole just under the crease of my arm pit I have tried putting band aids on it but we re it is and bending all the time makes them fall off . It s been here for about 1 week and it has a really bad sense to it like really bad. I have been cleaning it but now it is getting red around it and starting to look gross
It could be an abscess, maybe minor or major, depending on the size of the bump. Keep your armpits Chat Doctor.  You could also use a Magnesium sulfate ointment thrice a day till it develops a pus point and bursts out all the contents, which you could then easily clean with an antiseptic solution like Detail. Follow hygienic practices and use talcum powder if need be. Avoid antiperspirants as they tend to clog pores and stuff infection-causing bacteria inside them producing such infections.