<s>[INST] Hi, My daughter has two mosquito bites, and got a big reaction on the site of the bites - some swelling and a lot of itchiness. Just a day after, it looks like there is a black crust on the surface. Is this normal healing? i am worried about the black appeareance but it doesnt look skin deep and i know old blood can look black, but whenever she's had open skin lesion before, it heals brownish or redish-yellowish. [/INST] Dear patient, mostly likely that is just clotted blood. Keep observing it, put a cooling cream on it like fenistil or similar. If it gets bigger or red or keeps swelling please see a dr nearby, otherwise that should heal by itself. Hope this is helping you , if you have any clarificatons you can get back to me, if this was helpful please kindly rate my answer. Best regards </s>