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Mehmet Oz, MD, Cardiology (Cardiovascular Disease), answeredOne possibility for small, pus-filled bumps on your chest is that you've developed folliculitis. This common condition occurs when hair follicles become infected and inflamed. One specific form of this condition is called pityrosporum folliculitis. It's caused by a yeast infection and typically produces red, itchy bumps on the chest or back. This form of folliculitis is most common in male teens and adults.Helpful? 1 person found this helpful.