Got bit by a mosquito a couple days ago, it's swelled and im allergic. it's on my hand and my hand has gotten weak. it is also running down my forearm?

? cellulitis: Disconcerting description, and would wonder if there is a local infection which is involving your forearm.. See your doctor soon, and get this treated. Hope you feel better.

Allergy 2 mosquitoes: Immediate treatment includes washing the bite site, to prevent infection; take an otc antihistamine (diphenydramine or chlor-pheniramine), and apply a cold pack. If swelling causes hand weakness, go to urgent care to rule out infection & then possibly get corticosteroids to control this allergic reaction. Once better, get tested for mosquito-ige; immunotherapy may be available to prevent this rxn.