what causes pustules on skin
Pustules often form after an insect bites you. Pustules may also form if your skin is inflamed due to an allergic reaction to food, environmental allergens, or poisonous insect bites. However, the most common cause of pustules is acne. Acne, also known as pimples, causes inflamed patches of skin that contain pus or oil. Acne develops when the pores of your skin become clogged. Bacteria on the surface of the skin and the buildup of dead cells can also lead to acne.