My son received, what appeared to be, a bug bit (small red bump) on his back (close to the arm pit) yesterday. It was itching him. So I applied cortisone to ease the itch. Tonight, I noticed it has grown to form a welt, and seems to be spreading underneath the armpit. The welt has the shape/size of a Lima bean, but the redness is spread out to be larger of an area (larger than a half dollar coin. What could this be?
Hi, It seems that there might be having local allergic reaction due to some insect bite. Give him oral antihistamine like Cetirizine or Ben Chat Doctor. Continue applying cortisone cream. Ok and take care.