I read thru the comments but may have missed it. How many injection sites do you use? Did it happen more than once at different sites? I have heard different opinions ranging from rotating 6-8 sites, Did you mean that you were doing glute shots only for an entire year? I made a very similar mistake for my second cycle which contained short estered products making it suck that much more. I never let full recovery happen and it kept getting worse and worse so that even now my glutes are not the same, if you decide to keep using it You should dillute it 50/50 and split the injection in half. Some people say heat it up, some say take a shower right after, some say work out right after but different things work for different people and you have to find your thing. Another thing to consider is that maybe you will never react well to high concentration products, I know several people like that. Some sources use eo and some even use guaiacol when making the high concentration stuff and either of those things can be contributing to your bad experience. It could be a number of things but if it were me I would give myself time to recover a bit before switching to a lower concentration product.
That is only my opinion, I am new to eroids but have been doing this for a very long time, unfortunately I probably started a year or two earlier than I should have but the info on how to do things right was not so readily and easily available as it is now.

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I ordered some test e 500 once upon a time and shot it in my ass. The next day I had a golf ball sized knot on my ass. I ended up throwing it away. No abscess, just a giant lump. From then on I ordered 250/mg/ml and shot twice. I don't mind the needles but having to take off from the gym for a week was a lesson learned. Some people can inject that with just a little pip, not me. Sure am glad I didn't pin my thigh that time.

Lower milligram, more is not better

Ok bro, don't listen to any of these guys. Ed is here to help.
First what you need to do is walk to your nearest wal-mart, this will loosen up the fibers. Go to the med isle and you are going to be looking for this shit called Midol. Grab a bottle of that, next walk a couple of isles over and find an ointment called Vagisil. Pay for it and then go home.
Once you are home, take 4 Midol and rub the entire bottle of Vagisil all over your body. Walk to your mirror, look yourself in the eye and say: "I am a Pussy!" Five times. After that, turn on the Lifetime channel relax and cry yourself through a good movie. If your leg still hurts you probably should go see a doc and quit dicking around with the high MG stuff. I'd be willing to bet that you have an abscess. Sterilize the site, take a clean syringe and stab it and pull back the plunger. You'll prolly find some milky goo.
Hope that helps,
All my love, no homo
Ed

If the gear hurts in your butt, it will hurt everywhere else as well, I assume the problem is over and you have recovered

A few things you experience has taught you, High concentration gear has a higher risk factor of PIP and PIP and fever like symptoms go hand and hand and lumpy painful gear sucks

Icy hot !!!!!! ;) I wish yah could see my facial expressions

I did t 400 in the quad ONCE.

Brother unless the injection spot is red with fever along with swelling then you will be fine. I mean if you are set on seeing a doctor then go for your on peace of mind but. Just because it swollen doesn't mean you have a friggin abscess. If you had one you would know it I promise. Cellulitis is the same it would have redness,swelling and fever.

Brother I understand the temptation. I, like a lot of other people have been gearing up for a long time. You should try using a lower mg. personally I get the same results on 250 mg split into two injections than taking 450 split. I just stopped my test 450 because it was just slowing me down being sore for a week. Keep that in mind. If you get good results by using a low mg then there is no reason to up it.

well mate if you intend on doing 1ml of 400mg of test, il give my two cents.

warm up oil very well before pinning. massage area well after pinning.

split into two injections, each barrel containing 0.5ml and pin into different muscle groups obviously.

pin into an area an hour or two before training that specific muscle to help blood and the oil flow.

EDIT

reading over what you said again bro, id go see a doc..as flash said below, if its cellulites. it is nothing you want to wait around and waste time with. take it from a person who has gotten it before..it is not something you want, go to the doc and they will fill you up with penicillin as they did with me.
just take care man, your health ALWAYS comes first.

PIP you say,........ ..........from Test 400,

I'll get back to you,........ ...as soon as I quit fuckin LOL.

Bit of advice - Avoid high concentration gear. Unless you're running real big boy cycles with a lot of oil there's really never any need.

it is the high concentration.. basically your body is rejecting the "foriegn" substance ..

https://www.eroids.com/forum/steroids-qa/anabolic-steroids/causes-and-so...
That's the sticky for pip problems go ahead and give it a read.
As for me personally I can tell you the concentration is probably too high to hold well, and you might consider cutting it with sterile gso. I've done that to cut my sust 500 and it works very well. Take a cheap hairdryer to heat the oil before you pin it as well, that's helped me a ton. You may also consider keeping to the glute or ventroglute with pippy gear as I get the worst pip from my quad injections. As for recovery from this, if its not an infection, just takes time. You can try a heating pad and working the muscle to increase blood flow to the area but your body just needs to absorb the crystals. Ibuprofen can also help you get through it.
If it has a red circle that continues to grow around the injection site you may want to consider going to a doctor as it could be an infection. The sooner it's treated the better it will turn out for you. I always keep some 500mg cephalexin on hand especially when I'm frequently pinning short esters. Hope this helps

Test 400 is a high dose product. It more then likly had guaiacol or EO in it. Either you have an allergy or an abcess. Like flash said go see a doctor now.

smh. go to the dr asap, (now) google cellulitis. good luck.