Simple and quite common depending on the environment. The rash occurs when sweat gets trapped in the sweat ducts, producing a pattern of itchy red dots on the skin.
Allergic reactions
This goes without saying. The result of an allergic reaction to foods, substances, medications, or insect bites or stings, resulting in skin redness and itching.
Folliculitis
Inflammation of hair follicles usually triggered by bacterial or fungal infections. The result is the formation of pus-filled red dots that can cause discomfort.
Cellulitis
A bacterial skin infection that causes redness and swelling of the skin, which is warm to the touch. Cellulitis often requires medical attention and treatment with antibiotics.
Impetigo
A contagious bacterial infection that is often easily transmitted between children. Impetigo is characterized by red sores that open, ooze fluid, and then form a crust.

Vasculitis
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