Red dots on the skin are quite common and can come from many causes. Here’s a simplified breakdown of what might be behind them:

Petechiae and Purpura: These are tiny red or purple dots caused by broken blood vessels under the skin. They may result from stress, certain medications, or platelet disorders.
Cherry Angiomas: Bright red, raised spots that are usually harmless and often appear with age.
Heat Rash: Happens when sweat gets trapped in skin pores, leading to small, itchy red bumps—especially in hot or humid weather.
Allergic Reactions: Red, itchy dots may appear from reactions to food, medications, or insect bites.

Folliculitis: This is inflammation of hair follicles, often from a bacterial or fungal infection. It can cause small, red, sometimes pus-filled bumps.
Cellulitis: A deeper skin infection caused by bacteria. It can cause redness, swelling, and pain and needs prompt treatment with antibiotics.
Impetigo: A contagious skin infection, mostly in kids, that starts with red sores that ooze and form a yellow-brown crust.