I have these pus and blood filled bumps under my arms for a while but no i have one on my inner thigh. what should i do??

See your doctor: You should be examined by your doctor. You may have an infection that needs to be treated. The only way to do that properly is to be seen by a doctor.

A skin condition: called hidradenitis suppurativa. This is a condition where you have cysts that come together usually in the sweat producing glands. They become painful and can form abscesses. Sometime you may need antibiotics for this.