What should you know about cellulitis after a mosquito bite?

A mosquito bite often causes a small itchy bump and local swelling. Cellulitis tends to make the surrounding skin progressively warm, red, swollen, tender, or painful; the area may become larger over time. Scratching can create tiny breaks that let bacteria enter, but a bite mark alone does not diagnose infection. Take a photo beside a familiar object and gently mark the outer edge of redness to help identify change. Avoid scratching while you arrange advice.

Wash the bite gently and keep it dry. Seek prompt medical advice if redness expands, pain increases, the skin becomes hot, or swelling continues to build. Do not pop a blister, squeeze the skin, or apply unprescribed antibiotic cream. If treatment is prescribed, use it as directed and report a reaction. Tell the clinician if you have diabetes, poor circulation, immune suppression, or a history of serious skin infections, because these details affect assessment.

Urgent assessment is needed for fast-spreading redness, severe pain, pus, red streaks, fever, chills, dizziness, confusion, or feeling markedly unwell. These can accompany a serious spreading infection, including sepsis. Swelling of the lips, tongue, or throat, wheezing, or trouble breathing after a bite needs emergency help for a possible allergic reaction.

Ask whether this is a normal bite response or cellulitis, how often to check the skin, whether you need prescription treatment, and which changes require emergency care. Ask for safe ways to control itch without damaging the skin.