Dry skin bumps, which might resemble pimples and might be red or white in color, can be caused by many factors. The most common instigator of these bumps is a skin condition called keratosis pilaris, but it also can be caused through allergic reactions, where the affected area can become itchy and swollen. Other skin-related irritations such as hives and eczema can also be a cause of dry skin bumps. Similarly to allergic reactions, the symptoms of hives and eczema can also include redness, swelling and extreme itchiness. If other symptoms, such as a raised temperature, are experienced along with the dry skin bumps, it is important that medical advice is sought.

Keratosis pilaris, a skin condition that is most commonly responsible for dry skin bumps, is a result of excess proteins in the body blocking hair follicles. The result of these tiny blockages is the appearance of raised, hard white bumps on the surface of the skin, which can often have a red or pink edging. This condition is most likely to occur on the upper arms and thighs and can be a result of having very dry skin or a deficiency of vitamin A in the body. This particular cause of dry skin bumps cannot be removed completely but can be treated topically. Keratosis pilaris is known to be a hereditary condition.

Other causes of dry skin bumps include eczema and hives. These other causes have differing symptoms, and the affected area can become scaly, red and painfully itchy. Both of these forms of skin irritation can be caused or exacerbated through allergic reactions, food intolerances and stressful situations. Unlike keratosis pilaris, these conditions can be treated effectively with the use of antihistamines and dermatitis creams and lotions.

Allergic reactions can also cause dry skin bumps without the ongoing symptoms of eczema or the deficiencies that can cause keratosis pilaris. Allergic reactions that result in dry skin bumps can stem from contact with irritating materials such as wool and rubber, from intolerance to certain food types or as a result of seasonal weather. Some allergic reactions can be controlled through the use of antihistamines, but this is not always effective. Generally, however, dry skin bumps occurring as a result of allergic reactions will pass when the causing factors are removed, such as limiting contact with irritant materials or the reduction of pollen in the air because of the changing of seasons.