Hello all, resurrecting this old thread, I guess. I'm 58 and about 4 months ago started TRT involving testosterone pellets. I had been on t-injections for over a year with no issues, but a friend at work uses the pellets and talked me into it. About 6 weeks into the pellets I started having this paresthesia like you all are suffering from. Same events bring it on, about to sweat and the feeling of pins and needles/hot flashes all over or localized to hands, feet, back, chest, sides, lets, scalp, face, etc. They last anywhere from 30 seconds to a minute or two. The caffeine issue interests me because around the same time I had greatly increased my coffee drinking. I wonder how long it would take to resolve itself if it were caffeine. I take zyrtec or claritin but don't really notice any effect from it. Some days are worse than others. If I have night sweats, I'm awakened by the pins and needles, burning, itching and have to get up and walk around and cool off. I was short sleeved in 20 degree weather the other day at work because I didn't want to break a sweat when clearing out some ice after a storm. It's unnerving. I have been diagnosed with low Vitamin D but I've been that way for years. Vitamin D is in range now. This neuropathy has only come about after the testosterone pellets and coffee increase. I go to a low-t clinic and they don't have any idea. My blood tests came back in range with the other hormones.....estradiol and progesterone. Vitamin B12 was in the high range, but I had gotten a B12 shot.