Red spots on the skin occur for various reasons. For example, exposure to irritants can cause dermatitis, fungal infections can cause ringworm, blood vessels can cause spots called purpura, and some autoimmune disorders can cause rashes.
Some spots will go away on their own, but others may require treatment.
This article discusses 13 causes of red spots on the skin, whether it is a cause for concern, and how to seek immediate medical attention.
Heat rash (Milaria)
Red spots on the skin after exposure to the sun are caused by a condition called “heat rash”. A heat rash (miliaria) occurs when the sweat glands under the skin are blocked. It causes small, red, spiky bumps on the skin that are itchy and painful.
Heat rash usually occurs in skin folds or areas where sweat collects, such as the armpits, chest, back, arms, and groin.
People who live in hot climates, sweat a lot, or lie down for long periods of time are more likely to develop heat rash.
Heat rash can be treated at home with cold baths, cold compresses, and loose clothing to reduce skin temperature. Also, avoid applying thick moisturizers that trap the skin’s heat. 3
Heat rash usually goes away on its own after a few days. However, if the skin is damaged, it can cause secondary infection. In severe cases, oral or topical antibiotics may be needed to relieve pain and clear the infection.
Contact your health care provider if you develop signs of infection, such as a hot rash, peeling skin, or purulent discharge.
Cherry angioma
A red spot on the skin can sometimes be a cherry angioma (or cherry hemangioma), which appears as a round red or pink spot made up of blood vessels. The ball can be raised or leveled. A growth may be mistaken for a tumor, but it is not cancer.
Cherry angiomas are common in adults 30 years of age or older. They usually appear on the trunk, but can also occur on the hands, feet, or scalp. Sometimes the growth changes in size and bleeds, but this does not mean that there is a problem.
Cherry angioma is diagnosed by a doctor’s examination. They usually do not require treatment. However, if the appearance of growths bothers you or if they tend to bleed, they can be removed.
Your provider may explain options for removing growths, such as laser or liquid nitrogen. These procedures are usually harmless.6
Overview of Cherry Angioma
Contact dermatitis
Red spots on the skin can be caused by contact dermatitis, a common skin condition. This happens when your skin is irritated or comes in contact with something you’re allergic to.
Contact dermatitis usually presents as an itchy red rash with bumps. Also, the skin of any part of the body becomes swollen, dry and flaky.