Miliaria rubra Miliaria rubra, or “prickly heat,” is the most common type of heat rash and commonly affects newborn babies ages 1 to 3 weeks. Slightly deeper occlusion results in red papules and pustules (miliaria rubra or ‘prickly heat’). Miliaria most often affects the forehead, neck and upper trunk and occluded areas of babies in the first few weeks of life.

Understanding the Context

It settles within a few days on cooling and removing occlusive clothing. Miliaria rubra is characterized by the small secondary inflammatory papules and pustules. Obstruction in this type of miliaria occurs in mid epidermis. Clinical findings are mostly on the forehead, upper trunk, volar aspects of the arms and covered parts of the skin.

Key Insights

Miliaria rubra, commonly known as heat rash or prickly heat, is a common skin condition caused by the blockage of sweat ducts that carry sweat from sweat glands to the skin surface. Although this rash can be caused by fever, heat rash is more commonly seen in infants who are dressed too warmly… Miliaria rubra (also called "prickly heat") results in papules and pustules from obstruction in the mid-epidermis. It is important to ensure that the baby is not over-wrapped, and once the heat stress is removed the lesions usually resolve quickly. In some newborns, the pustules rupture before delivery and only hyperpigmented macules are visible at birth, as seen on the face, neck, and chest of this newborn. Heat rash, or miliaria, is a skin condition that happens mostly in babies and young children.

Final Thoughts

It looks like tiny red bumps or tiny blisters. Heat rash is sometimes also called "sweat rash" or "prickly heat." Here's what parents need to know about heat rash, and how to help prevent it. Baby Heat Rash (Miliaria) Guide: Types, Treatment & How to Tell It From ...