I get this too on reta and it has kept me from going above 3.5 mg a week. No magic fixes here, but regular Advil or similar helps along with lidocaine or hydrocortisone cream, though maybe not so much for the hair follicles.
Seeking anyone who's gotten past this issue. Currently at 6 mg weekly of reta, which I like because the weight is coming off and I can still hit my macros, but the skin sensitivity is really bad. Taking two antihistamines a day plus zinc based on earlier suggestions, yet it still feels like needles coming out of my hair follicles. Any tips?