Mosquito Bites: When to See a Dermatologist or Surgeon - Dermatology

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Insect bites?


On the evening of June 25th, my left upper arm was bitten by a mosquito.
On June 26th, I developed redness and swelling.
By June 27th, I started to notice pus, and I applied disinfectant and erythromycin ointment.
On June 28th, the area of redness expanded to about five times its original size, and the pus increased as well.
It is extremely painful to the touch, and I also have a fever and headache.
Given this situation, should I go to a dermatologist or a surgeon? Is there a possibility that this could progress to cellulitis? I have a midterm exam next week and I'm wondering if it's serious enough to see a doctor.

Nian An, 10~19 year old female. Ask Date: 2023/06/28

Dr. Li Yufen reply Dermatology


Hello: Based solely on the textual description, it is not possible to accurately diagnose a skin disease.
The prominent symptoms of redness, swelling, heat, pain, and pus are indicative of a bacterial infection following an insect bite.
If the condition continues to worsen, it may lead to cellulitis.
It is recommended to consult a nearby dermatologist for diagnosis and treatment.
Thank you!

Reply Date: 2023/06/28

More Info


When it comes to mosquito bites, most people experience mild reactions such as redness, swelling, and itching. However, in your case, the situation seems to have escalated significantly, warranting a closer look. You mentioned that the bite area on your left arm became increasingly red and swollen, with the swelling expanding fivefold and the presence of pus. Additionally, you are experiencing pain upon pressure, fever, and headaches. These symptoms raise concerns about a potential secondary infection, which could lead to more serious conditions like cellulitis or even abscess formation.

Given the progression of your symptoms, it is advisable to seek medical attention promptly. While a dermatologist specializes in skin conditions, a surgeon may be more appropriate if there is a need for drainage of an abscess or if surgical intervention is required. In your case, since there is significant swelling, pain, and the presence of pus, it is crucial to see a healthcare provider as soon as possible. They can assess the situation, determine if there is an infection, and decide on the best course of action, which may include antibiotics or drainage of any abscess.

The concern about developing cellulitis is valid. Cellulitis is a bacterial skin infection that can occur when bacteria enter through broken skin, such as from a mosquito bite. Symptoms of cellulitis include redness, swelling, warmth, pain, and sometimes fever. If left untreated, cellulitis can spread and lead to more severe complications, including systemic infection.

In the meantime, while waiting for your appointment, it is essential to avoid scratching the bite area, as this can further irritate the skin and increase the risk of infection. Keeping the area clean and covered can help protect it from additional irritation. Over-the-counter pain relievers like ibuprofen or acetaminophen can help manage pain and fever, but be sure to follow the recommended dosages.

If you notice any worsening of symptoms, such as increased redness, swelling, or fever, or if you develop chills or other systemic symptoms, do not hesitate to seek emergency care. It is better to err on the side of caution when it comes to potential infections.

In summary, based on your symptoms, it is highly recommended that you see a healthcare provider, preferably a dermatologist or a surgeon, to evaluate the bite and determine the appropriate treatment. Prompt medical attention can help prevent complications and ensure a quicker recovery, allowing you to focus on your upcoming exams without the distraction of an untreated infection.

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