Blister: A collection of fluid underneath the top layer of skin (epidermis). There are many causes of blisters, including burns, friction forces, and diseases of the skin. Also known as bleb and bulla. QUESTION Ringworm is caused by a fungus. See Answer From Skin Problems and Treatments Resources Skin Care for PsoriasisIs Your Skin Trouble Blocked Hair Follicles?How Psoriasis Affected An Actress' Career Featured Centers Good and Bad Foods for PsoriasisVideo: Getting Personal on Life With MS Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19
