A skin allergy, or allergic contact dermatitis, produces a red, itchy rash that sometimes comes with small blisters or bumps. The rash arises when the skin comes in contact with an allergen, a usually harmless substance that the immune system attacks. Allergens trigger allergic reactions.
Hydrocortisone cream (1%) is available without a prescription and may soothe many rashes. Stronger cortisone creams are available with a prescription. If you have eczema, apply moisturizers over your skin. Try oatmeal bath products, available at drugstores, to relieve symptoms of eczema or psoriasis.
Hives, also called urticaria (yer ti CARE ee uh), are red, itchy, raised bumps or welts on the skin. They may be small, like mosquito bites, or many inches wide. Hives can appear alone, in a group or can connect with each other to cover bigger areas.
Measles-like bumps on the foot of a patient with COVID-19: Dermatologists have seen bumps that look like measles on the chest, back, and other areas of patients who have COVID-19.
Hives are red raised bumps or welts on the skin. Hives (or urticaria) is a common skin reaction to something like an allergen (a substance that causes allergies). The spots can appear anywhere on the body and can look like tiny little spots, blotches, or large connected bumps.
Fortunately, most stress-induced rashes go away on their own within a few days; however, they can come back. Some may persist for as long as six weeks. Avoid scratching the rash, which can make it worse and may even spread bacteria through tiny scrapes in the skin.
Leukemia cutis appears as red or purplish red, and it occasionally looks dark red or brown. It affects the outer skin layer, the inner skin layer, and the layer of tissue beneath the skin. The rash can involve flushed skin, plaques, and scaly lesions. It most commonly appears on the trunk, arms, and legs.
“It looks like red-brown to purple firm bumps or nodules and represents the leukemia cells depositing in the skin,” Forrestel says. “Treatment for leukemia cutis is simply treating the specific type of leukemia. There's nothing separately we do to treat the lesions.”
A stress rash usually looks like raised red bumps or hives that range from a single welt to a cluster of tiny dots. Commonly, these clusters will appear on the face, neck, chest, arms, and hands. However, they are not limited to those areas and can ultimately appear anywhere on the body.
Red spots on the skin are common but they are not necessarily concerning. However, since there are many possible causes for red skin spots—including infections, allergies, parasites, and autoimmune diseases—the only way to know for sure is to get a diagnosis from a provider who can also prescribe treatment.
In general, your itchy skin should improve within weeks if you follow simple skin care steps. “If these changes do not bring relief and are distracting you from your daily routines or affecting your sleep, you should see your dermatologist,” Dr. Khetarpal says.
The immune system takes a big hit when the body is deprived of regenerating sleep, and Breus says this is a common cause of rashes and other skin-related problems.
Angioedema – swelling of tissue beneath the surface of the skin – can be mistaken for, or associated with hives. It can be caused by allergic reactions, medications or a hereditary deficiency of some enzymes.
Basal cell skin cancer can appear as an itchy, reddish patch. Melanoma can also occasionally appear as dark spots or moles that itch. Mycosis fungoides, which is a form of T cell lymphoma, also presents as red, itchy spots on the skin.
In most cases, cancerous lumps are red and firm and sometimes turn into ulcers, while cancerous patches are usually flat and scaly. Non-melanoma skin cancer most often develops on areas of skin regularly exposed to the sun, such as the face, ears, hands, shoulders, upper chest and back.
If your rash is made up of blisters, or if the rash turns into open sores, it could be the result of an allergic reaction, a reaction to medication, or an internal cause. Seek medical attention if a blistering rash affects the skin around your eyes, multiple areas in your mouth, or your genitals. The rash is painful.
Anemia rashes appear as itchy skin or tiny red dots under your skin called petechiae. The rashes are symptoms of iron deficiency anemia and aplastic anemia. Both types of anemia can be serious, but they are very treatable.
There are several possible causes for red dots on the skin, including heat rash, KP, contact dermatitis, and atopic dermatitis. Red dots on the skin may also occur due to more serious conditions, such as a viral or bacterial infection.
In terms of allergens, hives can be caused by factors such as pollen, medications, food, animal dander, and insect bites. Hives might also be caused by circumstances besides allergies. It's not uncommon for people to experience hives as the result of stress, tight clothes, exercise, illnesses, or infections.
What do stress hives look like? Stress hives can look a little like bug bites: both are red, puffy, and itchy, and may appear initially as individual bumps, says Stevenson. However, hives are more often irregular in shape and can join together in larger patches, especially if you scratch them.
A stress rash is simply a rash or issue with the skin caused by stress and anxiety. A typical stress rash reaction is breaking out in hives, known as urticaria. These are raised, itchy bumps that appear on the infected area and can appear anywhere on the body.
Common causes
There are a number of potential causes of rashes, including allergies, diseases, reactions, and medications. They can also be caused by bacterial, fungal, viral, or parasitic infections.