According to the American Academy of Dermatology, hives in adults can be caused by many factors that include allergic reactions to shellfish, nuts and insect stings. Hives can also be brought on by stress and exposure to the sun and some chemicals.Know More
Mayo Clinic explains that allergens, such as pet dander and pollens, and products containing latex can also cause hives in certain individuals. Underlying medical conditions that may trigger hives include hepatitis, thyroid disorders and immune system disorders. Individuals who undergo blood transfusions may develop hives in response to the procedure. Medications such as ibuprofen, aspirin, blood pressure drugs and naproxen may cause allergic hives in sensitive individuals. Mayo Clinic adds that risk factors for developing the condition include past allergic reactions and a family history of medical conditions in which hives are a factor.
WebMD reports that in certain cases, hives can appear with no underlying cause. Hives are also referred to as uticaria and present as itchy red swellings on the skin that range in size from small to large. Uticaria can develop anywhere on the body, including the tongue. In addition to itching, hives can sting or burn.
Hives that develop beneath the skin are referred to as angiodema, a condition that can cause severe swelling of the lips, hands, genitals and feet. Angiodema swelling typically dissipates within 24 hours, according to Mayo Clinic.Learn more about Skin Conditions
Brown spots are caused by an excessive production of melanin due to aging, sun or ultraviolet light exposure, as stated by Healthline. UV light exposure leads to the generation of melanin, according to Mayo Clinic. Melanin creates a tanned area that protects deeper layers of skin from the UV light.Full Answer >
A dry, flaky scalp can be caused by a number of skin conditions, including seborrheic dermatitis, scalp psoriasis and eczema, as stated by WebMD. The result of each of these conditions is dandruff, tiny white flakes of dead skin that can be visible on hair or clothing.Full Answer >
Most warts on the hands are caused by viruses found in the human papillomavirus, or HPV, family, according to WebMD. The virus invades the outer layer of skin, typically through a scratch or cut, giving way for the virus to form a wart. To develop a skin wart, a person must come in contact with a wart-causing virus. However, this can happen months prior to the formation of a wart.Full Answer >
White patches on the skin may be caused by eczema, yeast infections and other skin diseases, as stated by Mayo Clinic. Most of these causes are not serious, but a consultation with a dermatologist may be in order if home remedies are ineffective.Full Answer >