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In page Cellulitis:

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Immunosuppressive drugs, and other illnesses or infections that weaken the immune system, also make infection more likely. Chickenpox and shingles often cause blisters that break open, providing a break in the skin through which bacteria can enter. Lymphedema, which causes swelling on the arms and/or legs, can also put an individual at risk.[citation needed] Diseases that affect blood circulation in the legs and feet, such as chronic venous insufficiency and varicose veins, are also risk factors for cellulitis.[citation needed]