What is the cause of a diaper rash with satellite lesions?

Diaper rash with satellite lesions is typically caused by a fungal infection, most commonly by Candida species (such as Candida albicans). This type of rash is characterized by the presence of a well-defined, bright red rash in the skin folds, accompanied by smaller, similar-looking lesions, or “satellite” lesions, that are located nearby.

Candida thrives in warm, moist environments, making the diaper area a prime location for infection, especially when in contact with urine and feces. The appearance of satellite lesions is a hallmark of this kind of infection, as they indicate the spread of the fungus beyond the main rash area.

In contrast to this fungal cause, bacterial infections generally do not present in the same way and would be represented by different symptoms such as honey-colored crusts (typically seen with impetigo) or purulent discharge. Viral infections would also show distinct signs and are less commonly found as a cause of diaper rashes that display these specific characteristics.