Rash is an educational tool and memory aid available on iPhone developed by Bruno Girodias. It provides essential information on the main eruptive childhood diseases, such as gianotti-crosti, measles, scarlet fever, rubella, fifth disease, roseola, chickenpox disease, hand-foot-mouth disease, meningococcal purpura, and Kawasaki disease. The app offers useful information on their care, treatment, and preventive measures.

Rash features photos, illustrations, and memory aid sheets to help users identify and learn about these diseases. Additionally, the app is available in English, French, and Spanish, making it accessible to a wide range of people. Rash is an excellent resource for parents, caregivers, and anyone who wants to learn more about these diseases.