Noticing tiny red spots on your skin can feel worrying. They may show up suddenly or develop over time. Some are completely harmless, while others may point to health issues that need attention.

One common cause is cherry angiomas. These are small, bright red bumps made of blood vessels. They often appear with age and are usually harmless, though they may bleed if irritated.

Petechiae are another type, appearing as very small red or purple dots under the skin. They don’t fade when pressed and can sometimes indicate infections or blood-related conditions, so sudden cases should be checked.

Red dots can also come from skin irritation or allergic reactions. Conditions like eczema or contact dermatitis may cause itching, dryness, and redness, often triggered by products, fabrics, or certain foods.

Keratosis pilaris, often called “chicken skin,” creates small bumps on areas like arms or thighs. It’s caused by blocked hair follicles and is harmless, though moisturizing and gentle exfoliation can improve it.

Heat rash is another frequent cause, especially in hot weather. Blocked sweat glands lead to itchy or prickly red bumps, which usually disappear once the skin cools down.

Infections, both viral and bacterial, may also cause red spots. If these appear with fever, fatigue, or sore throat, medical advice is important. Some medications can also trigger similar skin changes.

While many cases are minor, you should seek medical help if spots spread quickly, don’t fade, or come with other symptoms. If you’re unsure, it’s always safest to consult a healthcare professional for proper evaluation.