Dr. John Thomas Mcdonnell MD

Swellings, referred to as weals, manifest on the skin as rashes. They are normally pink or red in color, possess an oval or circular shape, and may be surrounded by a reddish flare. Hives can be detrimental and awfully itchy.The weals normally appear in batches, and frequently occur on the face,...

In the early 19th to the 20th century, parents would have been surprised to know that future generations would be free from childhood diseases. Diphtheria was then one of the most common diseases that took the lives of thousands of children, while polio left thousands of children crippled. Measles...

Anaphylaxis refers to a severe allergic response, which can become life threatening if not treated immediately. It is often characterized by swelling, sudden lowering of blood pressure, difficulty breathing, and dilation of blood vessels. In some severe cases, the person may go into a state of...

It is very hard to diagnose lupus. Since two individuals can have different signs of lupus, doctors have a hard time diagnosing it and treating it effectively. To diagnose lupus, it can take a long time, which can be distracting to both the doctor and the affected person. The symptoms of lupus can...

A nickel allergy, or jewelry allergy, is the most common form of contact dermatitis associated with the use of earrings and other jewelry. Nickel is found in many items, including accessories, like necklaces and bangles, coins, zippers, watch straps, hair pins, and frames. This skin allergy affects...

Chicken pox is an infectious disease which affects mostly children under the age of 15, but it can even affect adults. Given the number of infections per year, it is like a rite of passage for every growing child.Symptoms of chicken pox The symptoms of chicken pox include:...