3. Sweat Gland Infection:
Significant causes of sweat gland infections are uncleanliness, prolonged hot and humid conditions in the arm, and excessive sweating. You can avoid such irritation by changing clothes regularly after bathing or sweating. In case of any infection, wear clothing that is very loose and air-tight to ensure air contact in the arm. Thoroughly clean the infected area to remove bacteria, dead cells, and excess skin oil.