### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hello. Im a college student who recently stated shooting up. I dont remember if this is a bruise or if its a spot where I shot up the other day. I was hospitalized 2 days ago for a few hours due to a severe allergic reaction I had to something unknown. I was going to sit down and play on the Internet when I noticed on my leg a black bruise looking thing. About the size of a golf ball. Its pink and black much like a bruise but has darker purple spots in the center of it. It doesnt hurt, but looks odd. On my legs there are some little like sores on my feet like a picked zit, there is no pus and they seem to be going away. Around my crotch area and upper leg theres scratches, anfew kind of look like smeered blood, from where I itched so hard from the reaction the other day. My sinus mucus is a dark yellow, been gettIng a cold it seems. Im curious, if i was in the hospital 2 days ago from an allergic reaction and they took my blood wouldnt they have seen if i was septic or not?? Or had blood poisoning? Im done using needles for good, I just hope I dont lose my life or a limb. I dont have a fever right now, dont think I have had one recently.

### output:

Hi, Welcome to Chat Doctor, I have read your query and understand the concern, This could be some sort of allergic reaction due to which there is blood extravasation has occurred at your upper leg area. You must need to consult general surgeon first to rule out any surgical possibilities like thrombosis or thrombophlebitis. You may require some blood works, ESR, PT with INR and ultrasound of local part. Treatment will be based on the underlying cause. However, you can take symptomatic treatment like antihistamines and topical steroid application.