Irritant reactions include miliaria (sweat rash), follicular pustules, and burn-like reactions. Antibiotics are necessary when massive hyperhidrosis, which may rapidly lead to miliaria rubra, is present. These miliaria are valuable historical documents now. In most cases, the rash of miliaria will resolve without intervention. Symptoms of miliaria include small red rashes, called papules, which are irritated and itchy. "Miliaria pustulosa" describes pustules due to inflammation and bacterial infection. Miliaria rubra is also known as "prickly heat" and "heat rash". Tschudi gave his scale in the "miliaria Helvetica" ("Helvetic mile"), corresponding eight Italian miles. Miliaria profunda is characterised by non-pruritic, flesh-coloured, deep-seated, whitish papules.