I recently switched testosterone oils because the pharmacy ran out of the original vials amd i have noticed whenever I inject T I get extremely itchy where I take my injection and its hard and bumpy, am I having a mild allergy or what could it be? I clean the area before I do my injection and I use new needles every time, I didn't change a thing except the oil. Also I tpok my injection Wednesday and it is now Saturday and where I injected is still extremely itchy and red, and has a hard bump beneath the skin.

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That is very possible. Testosterone is suspended in a vegetable oil in order to have sufficient volume and to provide the proper delivery rate. Not every company uses the same oil however a compounding lab can provide testosterone using a different oil if needed. My advice is not to inject again until you discuss this with your doctor and find a brand with an oil you are not sensitive to.

If you look though the post in this section for the last 6 months you will find this isn't the first time this issue has come up.

I've heard Sustanon can be suspended in peanut oil.

My T comes with cottonseed oil. You should be able to ask the pharmacy what the ingredients were for your old prescription and compare it to your new one.