A rash is an area of irritated or swollen skin that can be itchy, red, painful, and sometimes bumpy or blistered.
Rashes can result from a variety of causes, including:
- **Allergies**: Reactions to foods, medications, plants, or other substances.
- **Infections**: Bacterial, viral, or fungal infections can cause rashes, such as those seen in chickenpox or ringworm.
- **Autoimmune conditions**: Diseases like lupus or psoriasis can cause chronic rashes.
- **Heat and sweat**: Heat rash can occur when sweat ducts become blocked and swell.
- **Irritants**: Contact with chemicals, soaps, or detergents can lead to contact dermatitis.