I have a pam1312 and 799…. I never thought I’d own a Panerai but I love them now.

Chinese based brand trying to cash in on Longines name recognition and hoping people make the mistake and buy it. See also, Hormilton, Omeqa

It’s not an allergy… you had sweat unable to evaporate due to be trapped under the band and friction from the leather rubbing on your wrist. This is completely common and why everyone suggests not to wear leather when wearing you watch and being active