Common types of rashes include allergic rashes (e.g., contact dermatitis, hives), infectious rashes (e.g., fungal, bacterial, viral, parasitic infections), autoimmune rashes (e.g., psoriasis, lupus), heat rashes (e.g., prickly heat), etc.

Rashes can be caused by a variety of factors, including allergic reactions to substances such as medications, cosmetics, or certain foods; infections caused by bacteria, viruses, or fungi; autoimmune disorders; environmental factors such as heat, humidity, or exposure to irritants; and other underlying medical conditions.

Treatment depends on the underlying cause and severity of the condition. Common treatments may include topical steroids or antihistamines to reduce inflammation and itching, oral medications to treat infections or underlying conditions, and avoiding triggers or irritants that exacerbate the rash.