Test E shoulder pin lump????

[pro4truck22]

Posting this for a friend, 5 10, 225lbs, I would guess around 18% body fat. 250 test e 2x a week. Currently on week 7, most pins have been in allternating shoulders, a few in the ass just to let the shoulders rest. pin size is 5/8 of an inch. Alcohal wipe to swipe the bottle and one swipe across the shoulder. push oil on a 10 count... He has half an egg size lump but well below the pin site. It is red and says kinda warm to the touch. Its hard like a knot, and tender, pin was done 5 days ago..No flu like symp, and no fever. Just curious the reason for the lump below the pin site. This happened to him before a few weeks ago and thats why he did a few in the ass.....he is a little worried, thanks in advance.