I've got like very subtle I guess you'd call it bumps on my butt cheeks. They cover the area of my butt cheeks that would usually be in contact with a seat. I've just noticed them and don't think they've been there long. I first noticed them when I started studying for exams two days ago because I've been sitting in a wooden chair for long periods of time, upwards of like 3 to 4 hours straight for like 10+ hours a day. I also sweat a decent bit. I feel I've answered my own question but could this be anything more?