Ok so I personally feel i sweat easily on forehead when there's no AC or fan. And if I walk for few mins in a room where one fan is running (not fast enough) then I feel sweat on my forehead. If I do excessive activity like some normal excercises at home I feel sweat on forehead, front - mid scalp.. though I find back of neck wet too when touched. I had my hba1c test on 20/11/19 which was 5.0 , fasting blood sugar - 85 , avg estimated - 97. So, I don't think it's diabetes or prediabetes. When I went for it i also checked my weight on a machine myself. It was almost 90kg.I am 5'8-5'9. I haven't gone for thyroid test but I feel I don't have any symptoms of that especially my eyes look normal. I don't sweat under full speed of fan or AC (27-29 C). When I don't use AC in my room, only one fan( no windows), I feel the side of forehead touching pillow gets wet and other side exposed under fan is normal. My hands or feet don't sweat..just a little moist when I play game on phone too much.