Hi i have these tiny red bumps on the crease part of my left arm and the bumps have made that area sore and swollen. There is some inflammation and the bumps have become extremely itchy and the bumps fill up with white head like puss. I did go to a concert where i was sweating and others arms were rubbed against mine, and i dont know if that could have been a trigger.
Thanks for your query at Chat Doctor! It appears you have some fungal (dermatophyte infection) which probably has become secondarily infected. You must visit a dermatologist and start antifungal treatment and a course of antibiotic for few days. Keep the area clean. You can get culture of pus taken on swab and get tested for bacteria and fungus by microscopy and culture. Take care!