A skin lesion experienced after a bug bite depends upon several factors:
1. The type of the bug – different bugs have different poisons and skin lesions appear differently according to the type of bug;
2. Allergic reaction – different people react differently to outside substances like bug poison. An allergic reaction is an excessive inflammatory reaction to something from the outside. Such allergic reactions can be more harmful than useful. Some allergic reaction can be even life threatening;
3. Secondary bacterial infection – Manipulations with fingernails after the bite can contaminate the skin lesion and create an additional bacterial infection.
A dermatologist will be able to diagnose the real problem ... and if you are concerned about this girl's health, you can show some compassion toward her and take the action you feel is appropriate.
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