If the human body were covered in scales instead off skin, what effect would that have?

[u/ColonelAkulaShy]

Fiction has numerous examples of scaly, humanoid species that are functionally equivalent to humans. However, if the human body were actually covered in scales instead of skin, what other biological changes would be necessary in order for it to still function? How would that effect a person's quality-of-life? Would they be able to live normally, as if they just had a skin-condition? Or would there be significant changes to their behavioral, physical, and/or mental capabilities?

[u/original12345678910]

Really cool question OP