swelling/fluid in lower back

[K_PIN]

currently on a prop/tren/mast cycle 100mg ed. I'm on about week 4 and i've developed what seems to be water retention, fluid or swelling in my lower back. It looks bad almost like fat but i know it's not. It in the center of my lower back. Actually is starting to hurt. I can even feel pain when putting pressure there. Has anyone ever had this happen or know what could cause this??? I've never had this before and my lower back usually looks good and tight not like this!

[xelnaga]

If its displaced to the sides then yes.

[xelnaga]

Water retention + back bump