Itching isn't pleasant, but most of the time it's a temporary annoyance you can ease with a gentle scratch. However, it's sometimes a sign of an underlying disease or allergic reaction. When that happens, it's important to see a healthcare provider for diagnosis and treatment. This article will cover a variety of conditions that cause itching, also known as pruritus . Oscar Wong / Getty Images Conditions That Cause Itchy Rashes Following are some conditions that cause itchy rashes and key features that set them apart. Fungal Infections Ringworm, which has nothing to do with worms, is a common fungal skin infection. Ringworm has a distinctive ring-shaped rash. It may be red, raised, or scaly, and can develop on the skin, hair, or nails. Athlete's foot and jock itch are fungal infections that can cause itching and burning sensations. Vaginal candidiasis is a common fungal infection caused by yeast, a...