Itch, fever, or worse? Can mosquito bites trigger severe allergic reactions as well?

Mosquito bites are a normal part of being outdoors, particularly in tropical or monsoon areas. Most are harmless and work themselves out, but some bites can be a sign of a much greater problem. The Centers for Disease Control and Prevention (CDC) says to understand the signs when a simple itch could be a warning sign of infection, an allergic reaction, or even a mosquito-borne disease. (source: CDC)

A mosquito bite typically takes the form of a red, itchy bump that resolves within a few days. Yet, if the swelling becomes enormous, hard, painful, or hot to the touch, it may indicate infection. Such a reaction is worrisome if the redness starts spreading outward from the initial site of the bite. Yellowish pus or fluid may be present in some instances, suggesting cellulitis or other bacterial skin infections and requiring medical attention.

Certain people have overactive allergic reactions to mosquito bites, a condition that has been described as skeeter syndrome. In these individuals, the area around the bite can become extremely swollen, looking almost like a bruise or large welt. Other signs can be hives, itching elsewhere, and eyelid, lip, or throat swelling. While rare, some allergic reactions can develop into anaphylaxis, a condition that is life-threatening and involves shortness of breath, lightheadedness, and an acute drop in blood pressure. Such incidents need to be treated immediately as emergencies.

If left undisturbed, mosquito bites usually heal in a few days. However, if the bite becomes worse over a period of time, more painful, or develops signs of crusting and discharge, it may be infected from scratching. Scratching cuts the skin and allows bacteria to enter, which can produce severe local infections. Fever accompanying these signs is another indication that professional examination is called for.

When symptoms go beyond the area of the bite, including fever, body pains, nausea, vomiting, or tiredness, the issue is more serious. These indications can be indicative of mosquito-borne illnesses such as dengue, chikungunya, malaria, Zika, or West Nile virus. For example, dengue usually has a high fever suddenly, with joint and muscle aches and rashes on the skin between four to ten days after being bitten. Malaria commonly results in fever and chills, while the West Nile virus, although uncommon, can involve the brain and nervous system. It is important to obtain medical attention if any of these symptoms arise, particularly after traveling to regions where such illnesses are endemic.

Mosquitoes become more active in some seasons and geographical locations. If one does get bitten while traveling to a tropical nation or in India during the monsoon, then one needs to be more cautious. Most mosquito-borne diseases are prevalent in such geographies, and symptoms that develop after a bite, particularly flu-like ones, are not to be neglected. Informing a doctor about travel is useful in quicker diagnosis and directed treatment.

Not all bites are deadly, but being aware of what to watch for can be life-saving. Keeping the bite clean, not scratching, and applying topicals can take care of minor reactions. Repellents, long clothing, and removing standing water from the area are most important for prevention. As the CDC states, should symptoms continue to worsen or systemic signs develop, immediate medical care is essential. A mosquito bite can be tiny, but in some exceptional situations, it can have effects that are far more extensive than the skin