Red rash around the anus

An itchy bottom that's worse at night is often caused by threadworms , especially in children. The rash often look like clusters of tiny, often moist red spots or blisters and typically appear on the face and in the skin folds of the neck, arms, legs upper chest and nappy area. Mayo Clinic does not endorse companies or products. Today's Top Stories. Rashes are a common side effect of the epilepsy drug lamotrigine. That's a whole 'nother level of misery. Speak to your GP immediately if your itchy bottom gets worse after using topical corticosteroids.